Great! If I have 10k coins by the next week (and hopefully NOT FORGET ABOUT IT!) I'd be deciding which of my favourite artists do I want to tip... hmmm... then the bonus coins I can just use for artists that have a premium series! (Which currently is only one). I mean, it'd really suck to see all the numbers go to nearly 0 again, but since the bonus coins we get last for 30 days, maybe I'll have to reconsider to how many coins I need to buy out Silent Horror Z until that expiry date... hmm.
Personally, I don't really mind these kind of promo events, I don't really expect to have a buyback of coins I would later use for tipping, since, again, like other people have said, it will be a loss on your side, and I'm sure a lot of people don't want that. A very great start though!