They DO encores of some sales after a few days, so you may want to keep waiting until either that or the very last day to grab it. Then again, we're not talking about a blockbuster game that's already received 99% of the profit it'll ever make, or
one that COULD use more support if it weren't for the fact the
developer is defunct and the
publisher one of the least liked in the industry. Carpe Fulgur will still get a nice chunk of money, and if you want to support them more then may as well buy it at $10 rather than $5.