PrimeDice and GawMiners don't have a max. number of posts. Atleast I can't find it in their threads. They have minimum's, but no maximum's as far as I can see.
Thanks!
Well, Gaw Miners have a maximum of 50 posts (same as the minimum). That is, you can post more than that of course, but it won't get paid. As for PD, they also have a limit, though you have to calculate it; you receive a max of 2.4 btc a month, so it comes to about 2000 posts for Hero Members, down to 6000 posts for Members. Might be trickier to include in the list though, so it might not be worth it...