Selling to individuals is expensive, not just because of credit card fees, but also because of accounting costs, VAT MOSS in Europe, and support. In my case, a single support inquiry from a customer could negate income from that customer for an entire year.
At the same time, you can sell to companies, which pay 8-48x more, and will bother you with fewer support requests because they have things to do.
I think pulling of a consumer SaaS is extremely difficult in general.