In short
One Time payment for a lifetime license, especially with those fair prices
Very active development/support with a great and also active discord server
The insane amount of features and integrity of specific applications like minecraft
Thank you guys for all this I love AMP!
For new users I recommend updating your installation tutorials they’re very outdated 
BC i was paying over $60/month for middle ground specs for my server, so i decided to setup my own & found yall during my research.
I wanted a AIO solution for gaming servers in my home setup. I also wanted an on-demand Game server solution for many of my favorite games. Rust, Space Engineers, and Minecraft just to name a few.
I happened to notice your comment and wanted to make sure you knew OIDC + Local accounts has been added this week!
I heard about AMP from a friend who was using it and we both had the same goals: Easy spin up and spin down of servers so we can play with friends and have the flexibility of allowing our friends to start/stop servers, do admin items, etc. on our own equipment. I am also REALLY looking forward to building a “cluster” of spare hardware I have laying around into different AMP nodes so I can turn on specific games on demand.
Plus the face that most games are point and click deployment and are centrally managed, which makes FW rules and port forwarding SUPER EASY.