Point of $2-4:

1) Anyone can play, little risk. Very inviting for the beginner.

2) Same rake as $6-12, 10-20, 20-40, etc.

These places are looking to get the player who would be looking for $5 blackjack & quarter slots to give the game a try.

I certainly don't have a problem with them--brings more people to the game. Real easy in Vegas to go to another casino if they're not running the games large enough for you. I don't play at Imperial, Flamingo, Luxor when I'm out there because I agree that $2-4 is a waste of time. But I'm glad it's out there to bring in players.