So this made the rounds:
30%. Seems a lot. Rip off right? The problem is that most people saying this, including Tim Sweeney, never operated an F2P game outside an app store and have not the faintest about the operational cost.
So let's see what Apple (Google is similar but slightly worse) does for you if you sell through their store - all included in the 30%:
Payment Systems & Cost
The App Store offers payment systems and an easy way to pay, much easier than any other payment systems found online, increasing conversion immensely. This alone is worth a lot.
Everyone who worked on payment system integration knows how much work goes into this besides systems, UI, flow, optimizing etc. It is a lot of work and usually, you need 3-4 people just working on this - permanently.
Payment providers charge various single digit % of your revenue usually. So this is worth that percentage plus the bonus of ease of use.
In Store Payment System & Promotions
Apple offers iTunes cards in stores in most countries. Including promotions and sales of these. Remember if Apple does a sale on iTunes cards Apple pays for it, your margin is unaffected by it.
For free. This is an effective payment system for people without access to credit cards or bank accounts. Remember stores selling these also take a share - so this one is included as well.
If you ever ran into accounting in F2P companies their biggest headache is VAT handling worldwide. Every country has different VAT rates, laws and handling of virtual goods. It is a huge problem and usually, accounting is busy fixing things and keeping track of changing laws - in every single country. With Apple, you get a single invoice per month. VAT is virtually gone here. So yes you would easily need an accounting department for handling payments yourself - with Apple you need none. Zero.
Returns, Cancellations, Fraud
The second biggest headache of handling payments yourself is fraud & returns. Apple does this for you.
Available World Wide
Yes, world wide. No issues with integrating how many payment systems so everyone in any country can pay? I remember that one company I worked for had 120+ payment systems online and integrated 2-3 per week (!). Want to do this yourself? Good luck.
Download Cost & Updates
You don't pay for traffic, hosting, and more important for updating your app. The app store and iOS do this for you, usually automatic for the users. And you don't even pay for the traffic or hosting.
In other words, if App Stores wouldn't do all this you, as a small to a medium sized developer, would need at least 5-10 more people handling all of this if you launch world wide.
Is this worth 30%? Easily. And btw Tim Sweeney charges 30% as well in their Unreal market place ;)
Did I forget another advantage? Let me know.