Comment by dragonwriter

> So everything's going to be $1.03 or $1.04.

Rounding would apply on the total transaction, not individual items (because otherwise the individual posted item prices would just be false.) So, if there is an abuse route with round-half-down, it is that optimizing buyers would structure purchase to always total $x.01 or $x.02, possibly splitting planned purchases into multiple purchases to achieve that.

But even that isn't realistically a significant issue.