For those of you who don't know, Party has had these "casual cash" tables up to 100 NL for a while. You can't multitable when you use one of them, which also means they're pretty much all fishes there. I tried a 10 NL one recently and it's just what you'd expect, everyone limping every other hand and almost no 3betting.

Say I usually play 6 regular 10NL tables. Since I would expect a much higher winning rate at a casual one, this means I can afford to have much lighter BR management, and thus play casual at a higher level. Given this, is it possible to estimate whether grinding a casual table can be more profitable than multitabling, without having to play tens of thousands of hands to guess your "casual" winrate?

Is there a mechanism there to prevent players from playing 1 table on Party and a few tables on the other sites?

I would have to say no. How could there be?

Even if they technically could, it would be a pretty stinky move from Party. OP probably doesn't want to split his bankroll across sites.

Sort of. You can reduce the number of hands needed for the calculation because you don't need a precise indication of win-rate at the casual table, you just want to know if it's larger or smaller than your alternative of multi-tabling.

To keep it simple, suppose in multitabling games your ratio of Win Rate to Standard Deviation is R. This should be adjusted for number of tables. That is, if you play 4 tables at a time, R will be twice the ratio from individual games. I assume R is large enough that you are a consistently profitable player, otherwise this discussion is pointless.

If your ratio at the casual table is much higher, say 2R, this will be obvious reasonably quickly. If your ratio at the casual table is much lower, say 0, you'll figure this out soon as well (this statement could be taken as the definition of a consistently profitable player).

If your ratio at the casual table is similar to R, say between R/2 and 1.5R, then it could take a long time to figure out if it's larger or smaller than R, but you don't care too much. There's probably more variation from other factors, how you are playing, the time of day or year, the variation in other players, than from the overall difference between the two venues. Moreover, since they're roughly equal, you can play both a lot, so you'll get a lot of data to make a closer decision.

Why would Party want to have tables that restrict players from multi tabling?? Thats just a lot less rake that they aren't getting...

They do it to make depositors money last longer. Then they might venture into side games etc and also boost overall longevity of the recs time at Party so they enjoy themselves more and return.

According to Party Rep the casual games have 'been a success'.