I've mentioned it at least a dozen times here on HN because it's an underrated piece of software that works and is actively maintained, unfortunately their marketing is very weak.
Bonus: the code is not obfuscated, it's built on PHP using a proper framework and the author is very active on the support forums. I'm hosting it on Webfaction (currently migrating to Opalstack) for cheap and almost no maintenance.
I think it's hard to get taken seriously by companies when you sell a "script" on Invato too and I'm not sure why they do this? Why not just sell it yourself and receive more of the profits?
Nothing prevents him from doing it in the future though, when he already have enough customers to make a recurring cost profitable.