To quote you:

"obviously, I'll be 
much less likely to respect and buy from someone 
who regularly does this, or buys cels expressly 
for the purpose of reselling"

So, if you don't repsect people who buy solely 
for the purpose of reselling, you don't respect 
any of the dealer sites which make all those
great cels available?

They are buying with the sole purpose of marking
them up and reselling them.