Probably to reduce some friction from the process. They also don't charge a transaction fee(as noted in another comment), so i could see myself using this on my

Probably to reduce some friction from the process. They also don't charge a transaction fee(as noted in another comment), so i could see myself using this on my site. Of course a much useful service would be something like flattr. IIRC, There was some talk about them starting to accept bitcoins but i haven't heard about that lately.