[bav]

Adding NL1/2 will half-ruin the NL2/5 and could even kill it. People tend to aim for the lowest NL in the room, whatever that may be. If NL1/2 is available, they go there. If NL2/5 is all that's offered, they'll do that. So you're going to have many fewer fish in the NL2/5 game since they will instead be in the 1/2 game.

Rio was NL2/5 as the smallest for a while and it had some nice games. Then they started doing NL1/2 and suddenly the ONLY people ever playing NL2/5 were the locals--every visit to Rio I'd look at the NL2/5 table and recognize like 8 of the 9 players there (if they even had 2/5 going). But there'd be 5 tables of NL1/2 going. Same happened at Mirage...used to be NL2/5 was the bottom of their NL and the games were great, then they added 1/2 and the fish are far less common in 2/5. Rio, at least, had a change of heart and stopped offering 1/2; they're back to 2/5 as the smallest NL game and the games are better.