It seems to be a recurring problem with open-source/pay-what-you-want services that donations are hard to come by. I think that if you don't have to pay, than a

It seems to be a recurring problem with open-source/pay-what-you-want services that donations are hard to come by. I think that if you don't have to pay, than about 90% of potential customers who would have paid just won't. Sometimes it's because they think "hey, it's free". But I think in some cases there's even a desire to pay, but the organisation isn't geared for it. For example maybe the company's payment process is just too arduous to go through if you don't have to. Or maybe someone proposes it and is countered with "what's the business case?", which is hard to answer if it's free. I think the answer is just make some kind of optional paid service that some of your bigger customers will need. It might be an anathema to open source folks, but having an optional proprietary add-on, or some kind of paid maintenance service or something like that, may well solve the problem.