Serious questionAsk Adam if he's willing to pay out in Bitcoin?
The testers and coders I know only want Bitcoin to fix code.
Why don't you go ask yourself?

I don't see why he would not. How do you know this is not an option? You can trade ION on the market to BTC instantly anyway.
From my understanding, Github page will be update soom with specific information on bounties.
Are they not worried about the devs just instantly dumping their received ION bounty coins? I would venture to say this is exactly what would happen. A lot of devs wouldn't even touch it if they had to sell the coins. Would probably my lose too much value while dumping cause there is no volume. They will more than likely want BTC outright as they wont lose the value like dumping ION would.
I'm not convinced they thought this out properly. Not everyone in the crypto world is as thrilled about ION as the team and the couple hundred or so investors.