Your anecdote (and I assume the minimum bid wasn't insane) 
differs from the actual situation slightly because your profit 
gain occurred during the auction with high proxy bidding 
(or high proxy sniping, whatever). In which case, the high 
bidder certainly wants the cel. For highly-coveted cels, 
profit via high proxy isn't a problem. If that Lum cel has 
high enough demand, earning profit via consumer competition 
is not a bad thing at all. (Achika cels always go this way.)

While there may not be anything inherently WRONG with 
STARTING an auction with the intent of making a killing, it's 
definitely in bad taste to do so - with such a high margin.
I think *that's* the issue here...