Maybe I the buyer am willing to pay 150% in the store compared to on your website. I need to find my credit card, to trust one more random website with it... I have certainly decided not to buy things for this reason. And if I don't know too much about you, then I'll take all the sandboxing I can get, and happily pay a premium for that too.
And of course you only get 100% if you have zero fraud, zero hassles, no fees, no awkward cases.
Fair enough, yes the convenience factor can drive more sales which is mutually beneficial, I'll give you that. But the OS can still put you in control and let you run things inside a sandbox. Its the 30% money grab that I was complaining about because the app store provides no assurances on anything, and so we are pretty much back to square one. Its still a "random" binary off the internet. And for a basic sanity check, you can scan the hash to determine if its a known malware.
I think its just the same bullshit as Walmart and Target selling toxic toys and then shifting blame onto the original supplier. Not sure what happened to the lawsuit though..
Agree to your second point on fraud/hassles,etc...
And of course you only get 100% if you have zero fraud, zero hassles, no fees, no awkward cases.