eBay is not all that 'secure' - for a few reasons 
- unless you know the market very well, it's 
difficult to spot a scam. there is no credit check 
on bidders. if you do spot a scam, it has to be 
extremely obvious b/c from my experience, eBay 
safeharbor is 90% *worthless*. -_-' 

I actually prefer how Yahoo is set up over eBay; 
you have the option to require credit checks on 
bidders of your auctions, for example (haven't 
tried it), or credit checks on bidders of a 
certain feedback rating (don't remember details 
^_^'). There's also a "buy price" so people who 
are interested in simply breaking even can opt for 
that. Both auction systems have feedback ratings, 
but it seems that both sellers and bidders are 
failing to leave feedback ---- LEAVE FEEDBACK, 
PEOPLE!! 

I had another point, but I forgot... O_O
Oh, but the point is, it's best to leave auctions 
as a side-interest to the hobby; definitely visit
reputable dealers *first* before considering 
auctions - I mean, there are certainly ignorant 
people out there who think auctions are the *only* 
source for cels...