I'd be in support of this if the price was slightly higher - say 375 CSC per collection. I think there should be some incentive to buy on the month - otherwise you end up with a bunch of people who forever delay their purchases and in the long run, I don't think it'd benefit the site. It's the paradox of choice. Give people TOO many options and they get overwhelmed.
And that said, I've thought about starting up my sticker collection again recently (as I have nothing else to do) but the price and availability of some of the old collection items is nuts enough to put me off. Something does need to be done, imo.
^ This Every weekend we have bonus weekends have a different selection of old dp's/collections/seperate items from either for a higher price. Don't offer too many at once because it's overwhelming, keep the price reasonable (higher than before, but not twice as much) and circulate stock every time during the bonus weekends.
On one hand i think: items need to keep their value. But on the other side: I'm a collector: both collections and tc's, I need items for these but sometimes they are just unavailable or just absurdly expensive.

Release a selection of old items every time there&;s a CSC offer and watch the dollahs roll into the site.
Sounds like a great plan, and it would be a big incentive to buy more CSC during sales!