You pay what you want for an ENTIRE pro license. No royalties, no subscription bullsh*t, just a lifetime license. However you need to buy separate export modules in order to export to various more platforms.
But those export modules are also on HB, only at a more escalating price points.
Some might be interested in this, though. I use GM currently as my primary engine for now.. It's super super noob friendly and all you need is logic to create the game. There's not much of programming rules or what not. You can however do OOP with it if you want. Hands down it is one of the most underrated engines out there.

