There are enough companies like Paddle, Digital River. You can check their fees. 3% on top of processor fees is no issue.That's exactly what people need to consider in such corporate constructions, most don't even know about transfer pricing! Things are getting more complicated for every year from now.
Also, the armlength principle is not a problem in this case as there are no employees and no substance involved. You can just get a tax ruling and it will be even lower than 1%.
You should read @JustAnotherNomad above.