I understand your point of view, but private 
collectors are not businesses, and in a small 
community like this, habitual selling for large 
profit is going to make you a lot of enemies.  
Smart businesses know that making the most money 
possible by whatever mean possible isn't going 
to help when you lose all your customers through 
shady practices.  Having a good relationship 
with your customer base is a far better way to 
make money in the long run, because that will 
make loyal customers who keep coming back.

And I'm sorry, but I've seen this particular 
seller for years buy up cels that are good deals 
and then eBay them for triple, and heard of her 
doing so for quite a while before I started 
collecting.  Yet there are always excuses 
(repeatedly leaving the hobby, etc)  When she 
says she didn't intend to sell it for a profit, 
well, I just can't believe her after this long.  
Either be honest about what you're doing or sell 
it for what it is actually worth, under the 
definition of "it is worth what someone (you) 
paid for it"  If you start it around what you 
paid and it goes a lot higher, then I don't see 
any fault... that has happened to me a number of 
times.  And it's a hell of a lot more honest.