It's also a hard question to answer, because it depends on app popularity, price, complexity of the app, etc. For my next project, I am planning to roll over iPhone and Android nearly simultaneously, so I look forward to answering that question in a blog post, at least in a relative way.
As I'd be perfectly willing to do the minimal work of submitting your app for a small portion of the proceeds.
Dealing with international tax law probably makes this not worth it for a small company, particularly as a side business, but it's a thought...
At least that's how it was last year when I 'used' to do iPhone dev..
Apple only gives you access to the address book, very annoying.
Would love to get more access, to calendar, calls data etc...