Solutions to Easy Tip for Sites

I see a lot of sites now locking down with per month article limits etc. As annoying as that is on one hand, I also see the value of content without ads. I ALSO don't want to go through the whole process of creating yet another account / giving them my paypal et al.

Anyone working on solutions to tip small amounts? say with per day maximums, one click tips, reviews monthly for fraud etc. IOW if this resembles a tenner in my wallet, I would be much more comfortable tapping a button to donate. I am obviously projecting that's a case for many folks :)