I know exactly how you feel.  I have been doing 
this for a few years now, and while I'm very glad 
for some of the wonderful cels I have, nowadays 
this hobby is very frustrating and more 
expensive.  I was totally crushed the other day 
because a cel I thought very special popped up on 
YJ and I wanted to put in a bid, only to be told 
someone else beat me to it with a much higher 
bid- mine was around $150 - for a very oversized, 
cool cel, but with the character's eyes closed.  
I could even understand the cel going for $300, 
but it sounded like the highest bid was more... 
I actually did sell off half my collection for a 
car down payment btw mm. ^_^