This is desktop software, why is there a monthly fee? I occasionally want to send “nice looking” emails but get asked by lots of comms people about it. Recommending a monthly fee service is a non starter, but buying some software is pretty easy to decide. “Should I pay once? Or pay forever?” Is there anything in the functionality that takes advantage of SaaS? Other than updates and whatnot? Of course the price/value…
As some pricing feedback, I'd personally prefer to pay something like $75-85 as a one-time fee, with $20-30 optional maintenance to get access to the latest version and continued support - $20/month is way too high; yes, creating nice emails that work across clients is a PITA, but there are some very popular OSS templates out there that work great.