macbook enough for iphone app development ?

I decided to try selling few shitty apps after having seen what crap people acutally buy, tho it seems I need a macbook to make those

I don't want to buy an iphone on top of it so is the emulator thingy enough for development ?

If one person can get one version and can distribute it to others who can install it easily on their own phones, then it logically follows that all versions are easily accessible by anyone, at least so long as n_v≤n_p holds true.
the few people actually pirating android apps aren't organized enough to do that.

Regarding your point #2, no they won't.
i have at least 5 apps on my android phone that i paid for. no matter how many times you make that claim, it won't make it true.

Don't be naive, people are generally speaking lazy bastards, and having to go through an annoying process of searching for some third-party market and billing system and set up an account there just to give someone a dollar is beyond what a huge number of people are willing to do, however honest they may or may not otherwise be.
what the fuck are you on about? the android market is run by google, and uses your google account.