This is what I think, I'd have one stay at 150 pts per day, and add a higher one a day too. That way, you always have the regular 150 pts one going on, and if ppl feel that there's too many people in it, they can play the higher pts buy in one too.

You could always run a trial period on that too.

People complain about it being hard to get pts sometimes, you don't want to drive any traffic away. Create more options, not less.