Too many games on the go!

I am now overwhelmed and inaundated with too games because i belong to a lot of groups i think i would have to cut down the number of gropups i have membership of so that the number of game referrals to me will drop as it is hard to say no to a game request when you are part of a team or groups.

So what do i do.....

What is the ideal number of groups to belong too and what is the cut point.