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 ?

No, you need a real device. The emulator is incomplete (lacking libraries like encryption and a bunch others that are present in the device) and its speed is extremely different to the real device. Programs that seem to run fine in the emulator will crawl in the iphone. Apple really dropped the ball with it - it's a fucking joke. So, sadly you'll need an iphone.