Honestly, it's just not worth it for me. Figures are based on my last app and are by no means representative, I'm just explaining from my situation.
Supporting hardware: £100
Marketing and promotional materials: £1,100
My time (I don't normally factor in my time but technically it's time not spent doing other work):
240 hours x £50: £12,000
So £2,280 without factoring in my time or £14,280 factoring in my time.
This was for iOS so dev time was much faster than it would be on a new system and even on iOS I'm not guaranteed to make $1,000. The promise of $10,000 from RIM is not enticing at all.