# The Source Diversification ROI: When to Add a New Thrift Route vs. Doubling Down on Your Best Location

_By GradeThread Team · Published September 12, 2026_

> Add a new thrift route only when your best location's marginal ROI per visit has dropped below a new route's blind-test average. Here's the math.

# The Source Diversification ROI: When to Add a New Thrift Route vs. Doubling Down on Your Best Location

Expand your thrift sourcing routes when the marginal return per visit at your current best location has fallen below what a new, untested route is likely to produce — usually the point where you're seeing the same racks, same donors, and the same picked-over bins two visits in a row. If your best store still returns $180+ profit per visit with no signs of decline, doubling down beats diversification almost every time. The decision isn't emotional — it's a marginal ROI comparison, and you can run the numbers in under ten minutes.

## Why This Decision Gets Made on Gut Feel (and Why That's Costing You)

Most resellers either over-diversify out of boredom or over-commit out of loyalty to "their" spot. Neither is a strategy. We've talked to sourcers running eight routes because "more options feels safer," and sourcers running one because it's convenient — both leaving money on the table. The fix is to treat every thrift location like a channel in a media budget: you keep spending on it until the marginal dollar in returns less than the marginal dollar you could get somewhere else.

This matters more as your volume grows. At 20 items a month, gut feel is fine. At 200+, a 10% miscalculation in sourcing ROI compounds into thousands of dollars in wasted drive time and dead capital sitting in bins.

## The Core Formula: Marginal ROI Per Visit

Calculate ROI per visit, not per item. Per-item ROI hides the real cost — your time and gas getting to the store in the first place.

- Visit cost = drive time (converted to your target hourly rate) + gas + in-store time
- Visit return = total resale value of items sourced (at expected sale price, not COGS) minus COGS
- ROI per visit = Visit return ÷ Visit cost

Track this for your last 10 visits to your best location. If ROI per visit is trending flat or up, you're not saturated — keep going. If it's trending down over three or more consecutive visits, that's your saturation signal.

### Example: Best Location Trend

| Visit # | Items sourced | Est. resale value | COGS | Visit cost (time+gas) | ROI |
| --- | --- | --- | --- | --- | --- |
| 1 | 14 | $420 | $70 | $45 | 7.8x |
| 4 | 11 | $310 | $55 | $45 | 5.7x |
| 7 | 8 | $205 | $40 | $45 | 3.7x |
| 10 | 6 | $140 | $30 | $45 | 2.4x |

This is a location in decline. ROI per visit dropped from 7.8x to 2.4x over ten visits — most likely because the store's donation base or your competition changed. That's your signal to test a new route, not to keep pulling from a well that's running dry.

## How to Evaluate a Candidate New Route Before You Commit

Adding a route is a real cost: 3-6 exploratory visits before you know if it's worth keeping, plus the opportunity cost of not sourcing at your known-good location during that window. Run a structured test instead of a vibe check.

1. Pick 2-3 candidate locations based on category mix, donor demographics, or a tip (estate sale zip codes, high-income donation drop density, competitor scarcity).
2. Commit to exactly 3 test visits per candidate before making any keep/drop decision — one visit tells you nothing.
3. Log the same metrics you tracked for your best location: items sourced, estimated resale value, COGS, and visit cost.
4. Calculate ROI per visit for each candidate after visit 3.
5. Compare each candidate's average ROI against your best location's current (not historical) ROI per visit.
6. Keep any candidate location whose average ROI beats your current best location's trailing 3-visit average.
7. Drop candidates below that bar — don't sunk-cost your way into a fourth or fifth visit hoping it improves.

This test costs you roughly 9-18 store visits total across 2-3 candidates. Budget for that as a real, planned expense — not a side quest squeezed in when you're bored.

## Source Diversification vs. Depth: The Actual Tradeoffs

| Factor | Doubling down (depth) | Adding a route (diversification) |
| --- | --- | --- |
| Drive time efficiency | High — route is memorized, no wasted mileage | Low initially — new territory, learning curve |
| Category familiarity | High — you know the store's patterns and staff restock timing | Low — unknown restock cadence and category mix |
| Risk of oversaturation | Rising over time — same donor pool, same competing resellers | Low — fresh donor pool |
| Setup cost | Zero — already integrated into your week | 3-6 exploratory visits before ROI is known |
| Upside ceiling | Capped by store's inventory turnover rate | Unknown, potentially higher or lower |

Neither column wins outright. The mistake is picking one as a permanent identity (

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