bluewhale said:
does it make a difference to the conditions in vegas if you go during the WSOP?
Yes, absolutely. You will pay a higher room rate (or find less availability), plus table minimums will go up and there will be huge lines at the poker room.
However, if you do manage to get a seat at a poker table, you'll find that there's a horrendously awesome number of wannabes who feel the urge to play Sammy Farha at the $4/$8 limit tables. I was in Vegas during a WPT event; the fish were fishier than normal.
The blackjack conditions seemed to be completely unaffected at the $25+ level, although the $10 tables were more crowded than usual.