> in practice, transaction fees mean that about $2/mo is the minimum viable payment to actually mean something
another person who doesn't know about PayPal's micropayment account fees. They save us (ardour.org) about 23c per US$1 transaction, and we get the majority of our income from US$1 transactions. Instead of the usual 3.5% + 49c fixed fee on the order of 30c, PayPal' structure for this is more like 9c fixed + 4.99%.
If I was a believer in some deity that paid attention to such things, I would pray daily that PayPal does not decide to end these at some point.
Good news is that they now offer something called Dynamic Pricing, where instead of maintaining two accounts and choosing which one to use based on the transaction value, they will now do this automatically for you. Subject to approval, they say.