I tend to buy software and services in that price range by the year for both myself and clients. Expensing or invoicing a small monthly charge is too much hass

I tend to buy software and services in that price range by the year for both myself and clients. Expensing or invoicing a small monthly charge is too much hassle. Note, however, I am more hassle sensitive than price sensitive. I am also somewhat resistant to automatic charges, but that is probably just me. OTOH Neflix goes quite well with a small monthly charge. Maybe the yearly charge for them is a barrier. Your charge is so small that I suspect the recurring charge will generate a lot more money than a one-time charge or the lifetime charge.