Bought from Daffy before and he is a stand up guy.
Some people (like me) are perfectionists about their bikes so keep (almost constantly in my case) chopping and changing various bits of their rides. I try and pick bits up at bargain prices, if I do then change my mind I hope I am safe in the knowledge I can sell on for at least what I paid.
If I keep my eye on the forums and get a screamer of a bargain, then change my mind at some later date, so f'king what ? It's not neccessarily being bought specifically to sell on and make money, it's just a better mind-changing insurance if I can get it for a great price.
On the flip side of all this I have bought (and then sold on due to my wretched indecision) some kit in the past (anyone remember my red Indy Fab Deluxe, bought for an undisclosed sum (to save my embarresment) and sold on ebay for £300 - OUCH !) Swings and roundabouts........