Adding to the previous poster,
you can already see the items that will be
auctioned on the big web auction right now on
their page (you can select on everyday/big web).
That means you can browse the auctions even they
have not started yet and decide if it's worth for
you to pay those $5 to be able to bid when they
start. Just take in mind that some/many of the
cels arrive to scary prices at the end of the
auction, just to say that from all the times i
have participated on it i have never been able to
get anything as i was always outbidded (maybe
because i always went for high end cels).
Unfortunately for me (and fortunately for my
wallet) this time they are not auctioning anything
that i have special interest on, so might just bid
on 1-2 items if nobody else goes for them.