I hardly think I'd say that knowing the prices on 
something she buys is a bad thing.  It makes her 
an informed customer who isn't going to shell out 
way too much money for something she could find 
much cheaper.  I don't exactly think it's 
stretching too far to say that's a pretty *good* 
thing.
And as for mentioning the prices...well, if you 
don't appreciate it, then why not do the polite 
thing and keep your mouth shut?  Personally, I 
appreciated it quite a bit.  While I honestly 
can't afford the cels for what the fellow's 
asking right now, I admit I was interested; and 
now that I know that such cels could be found at 
lower prices--now *I'm* an informed consumer.  
And I like that.  ^_^
"Let the buyer beware" doesn't have to mean that 
you can't hear a little advice from people who 
know, every once in a while.  I prefer to benefit 
from the knowledge of others, rather than make a 
big mistake and line the pockets of somebody 
who's just out to make a buck by selling 
something that people could've bought much 
cheaper.  I'm not against people making a little 
profit in the world of business, but nor am I 
fond of getting myself ripped off.
Just my view on things..

~Mala