Kinda defeats the point of each individual raffle. The raffler usually wants to convey something, but you're ignoring the effort the rafflers put in by just joining them all.
If you want to join every raffle so you can win something, suck it up and painfully join each one.
At the very least you should be happy that there is a generous community who's willing to raffle items away for free. Sorry if I came off a bit harsh, but what you're asking just wont be done.