RIM has announced at its BlackBerry Jam keynote address in Orlando today that it'll be guaranteeing that developers will make at least $10,000 in sales of their BlackBerry 10 apps in the first year — if they don't, RIM will cut a check for the difference. It's a widely-held belief that developer participation in a mobile ecosystem is what ultimately makes or breaks it (which is why Microsoft has been incentivizing developers on Windows Phone in a variety of ways), but this takes it to a new level: developers don't want to spend the time to port their apps or write new ones if they won't see a return on investment, and a guaranteed payout of $10,000 is an interesting attempt to alleviate those concerns.