[lucideer]

> I hope to use this percentage to cover some or all of the costs.

I don't think the commenter above was trying to make out that 6% is not fair, just that they'd like to see the breakdown of this percentage covering some or all of the costs.

iTunes, Bandcamp and co. might not offer that breakdown, so you're definitely not worse, but it would be a really nice differentiator.

[have_faith]

I disagree about the breakdown. I think the vast majority of people are going to go with their gut feel in whether or not the cut sounds reasonable. Reasonable and fair being the goal but evaluation of what is reason and fair from consumers is almost always subjective. The breakdown is going to change when features of the service change, maybe quality is upped and costs rise or a host of other things change. I think from a marketing perspective "this is less than anyone else takes and it allows us to provide the service" is enough.