It's interesting to see how these fees affect everyone. I have a digital product, and while there were small fixed costs for the creation of the product up front, there's almost no variable cost going forward. I suppose incremental Amazon S3 usage, but the product is a 5 hour video course and the incremental monthly cost there per user is negligible (for now).

So, like others have mentioned, I'm paying a standard PayPal rake of ~3%, but don't really feel it because the product has been profitable for years and doesn't have any real variable cost.