What’s actually the highest-EV way to flip €15 of eBay credit?

I’m trying to treat this as a pure expected value problem, not a hustle story.

Assume:

– €15 eBay credit only (no cash added)

– Time is available

– Goal is to maximize EV per euro, not speed

My current assumption is that most common advice (phone accessories, clothes, games) is actually suboptimal at this capital level because the ROI is capped and competition is high.

It seems to me that the best play should be a single underpriced item (auction, miscategorised, bad title) where informational advantage beats turnover — but I’m not convinced I’m targeting the right categories.

If you had to turn exactly €15 of eBay credit into the highest possible amount within, say, a few flips:

– would you still go for fast-moving low-margin items?

– or is there a category where small capital + knowledge has a higher EV?

I’m probably missing something obvious here.