I also don't get pissed if a deal falls through. There shouldn't be any hard feelings!
If we wanted hassle free transactions with strangers, we'd go to Ebay. We're all among friends here, it's no big deal to me if someone changes their mind last minute. The occasional instance of indecision is well worth the guaranteed authenticity of what we're buying and selling.
Just set a price you think is fair. *Do not* say you will take best offers when you will not really entertain offers or will be offended by a lower offer. Saves yourself a lot of time.
Editted: When I re-read that, it sounded like a lecture! Sorry girls! That's just what I've found to be useful advice. When I didn't want to take best offers, I just set my price and Cat bought my bag and that was that. I think that's the best advice I can give, because I hear a lot of frustration from other members about pricing.