I think the fine line here is, don't be a ass about it. If you are, you might get the moola, but when you need your neighbors' help, they might be a little more reluctant.

That's why IF(!) I've been so sloppy others know about my supplies, I'm not going to make them pay blood. And I'll be more likely to accept barter. And even though I don't advertise, I have stashes of stuff even my friends don't know about. Any trading is done with the flash gear, not the stash gear.