Yes I have. Sometimes it better to throw in the towel and focuse on other things that flogging a dead horse.

Guilty of that...

Sometimes I get too excited with new idea and buy 1-2-3 domains for it but later on realize that idea was not so great in the first place or I just physically don't have time to put enough effort in development...

I don't usually give up, just leave sites get idol ... I didn't renew a domain for the first time this week modernwelshcooking.com is no more ... first time I've ever done that and I suppose the first time I've really given up on a site.

There is only one site and that was my hotel bidding script. I gave up before giving it a real chance and i don't know the reason why. Maybe because i couldn't provide a real content for the targetted audiance so i didn't start to promote it.

I usually give up and do a really simple layout until I come up with inspiration.