yep, all of that's true, but it's also true that 
on online auctions the market can change very 
fast as most people don't live in front of their 
computer. What i mean is, if you got a cel on an 
auction some day for a price of XYZ maybe it was 
because the person who would have placed a higher 
bid was not around that day/week.... I would only 
consider that an item cannot sell for a 
determined price if you keep relisting it a few 
times without luck...

Don't know about your experiences but personally 
it has happened to me to place an auction with an 
starting price, not getting any bids on the first 
2 batches and at the third time get 2 or more 
bids on that item...., but for sure pricing items 
and selling them is not an easy matter....

And about sellers saying on the auctions that the 
starting price is "less than what they payed 
for", well, i have doubts about if it's true or 
not on all auctions. Most of the times noone has 
ways to know what the seller has payed for the 
cel so he/she can put the desired start price and 
still say that that it's lower than what payed 
for making sound as if the item was a bargain....
Of course there are many honest sellers out there 
but as original prices are something that you 
cannot know for sure when i find one of these 
auctions i just ignore comments like those.