The only cels I've been less than happy with and  
then sought to sell or dispose of are ones which 
I've compromised on telling myself "This is OK 
its a relative bargain." I now never buy a cel 
thinking its OK. Rather the criteria I use 
is "See, Want, Must, Have, NOW!"

I'm not suggesting you go into debt or splurge 
insane amounts on individual cels (that of course 
is relative to each collector's financial 
ability). This is particular true for cels which 
are just within the "reach of affordability". 
This is different for everyone I acknowledge. But 
I think that you can be clever how you spend your 
cash.

If you compromise, sooner or later a nicer one 
comes along and you end up selling the first. 

Also your circumstances change. Certainly as many 
collectors are students its important that they 
have a budget but suddenly when afflicted by  
real income often they end up "churning" an 
entire collection to uprate it with more 
expensive cels.

Then again I despair of picking a nice cel of 
Ruri Hoshino or Asuka Langley up for anything 
short of a liver. 

Just my 2 cents