And what was the initial investment? $100.00 for a whole year!Dev tools are not free, the App Store is not free either. 30% is also not little.
Imagine being Tim Cook and losing 30% of your money. Imagine being poor and at the bottom end and losing 30% of the little you have, it will probably hurt you even more because you lapse out of minimum living standards.
Remember when Visual Studio and MSDN costed thousands of $$$ ?
Small developers couldn't afford it.
Also, small developers pay much less than 30%.
So let's say you sell $1000 in apps in a year, you pay Apple $300 and you keep $700.00.
$300/year is nothing compared to the actual cost of operations and maintenance of your own Apps Store or website, plus having to pay 3% or more to your payment processor.
If you don't do it yourself, you'll have to hire someone to take care of it. How much would it cost you?
Apple doesn't charge you a penny if you don't charge for your app. your business may benefit in many ways by having a free app available at the App Store (Advertising, exposure, value added services to your clients, etc.). All that for free.
If you make profit, well, share it. There wouldn't be profit without the App Store.
Now, are you expecting another App Store to distribute your app for free? That's what it seems some people are daydreaming about these days. Good luck with that.