[setpatchaddress]

The other things, yes, but 30% cut isn't a real problem. Have some perspective. You used to pay a lot more than that for packaging and distribution as a software developer, when software was still physical goods. (Yes, shareware, sure, but the number of developers who made a living out of shareware was extremely small.)

[vsl]

Have some history. After the physical distribution are and before MAS, there was (and still is) a large number of indie OS X developers distributing digitally. For a long time, FastSpring was the de-facto standard and its rate is 8.9%. Add a CDN or DevMate and 10% seems reasonable. DevMate in particular makes the difference stark: more flexibility, more functionality, 20% less.