I had intended to use PayPal's Subscriptions and Recurring Payments option. I had some concerns that there was a slight stigma with using PayPal, (unprofessional), but I feel that, perhaps that stigma has faded the last few years.
[as an aside, I've been using Amazon DevPay, and I feel that it's weirding too many people out. Too different from what they're used to]
Any thoughts on why to use these services rather than PayPal?