We purge their toys about 3-4 times a year, but they STILL have way too many!
I did finally talk my oldest son into getting rid of all the McDonald's toys though. His teacher at school has a treasure chest which they get to pick random toys out of. We bagged up his McDonald's toys and sent it in along with a note saying she's welcome to keep them for the treasure chest or pass them on if she doesn't need them! FINALLY got them out of our house!
As for the bigger things.... I keep thinking I need to just get rid of my youngest sons toys! Most of them are baby-ish toys, and he usually plays with cars or his older brothers toys. Of course the minute I think I'll do it, he comes out of his closet holding his shape sorter.
I did just put a tub in his room and put 1 toy in it that he rarely plays with. I figure I'll keep the tub in there and just randomly throw in things when I find them...
Writing this makes me want to go look for more to sell/donate!