For a lot of people $20 isn't a figure that they'd be spending on something that's having really good alternatives available for free.
Not saying that sync is bad or anything but the way you keep repeating how $20 or $90 for a lifetime licence is a steal sounds so patronizing to the people who can't afford it.
But for a lot of people this is the best alternative. As I mentioned in another comment, people will generally pay if it gives them a good experience. I used Jerboa up until now but it did not have an easy UX like Sync has had. So yes, functionally there are alternatives, but in terms of ease of use? Sync is the best I've seen.
I have, and for me Sync is still the best option and worth the money. I don't view it as a license, I view it as a thank you for developing this for us
Weird it deleted the wrong comment. No not patronizing anyone who can't afford it, just calling out the people who want quality things for free, or really the ones here who are offended that someone has the gall to ask for a bit back in return for their work.
And no, the ads aren't bad, like one every 10 posts. Although I'm always going to be someone who'll just pay to get rid of them