I totally agree.
The site OP linked to at least warns about scammy sites and risks associated. It also tracks prices on official resellers.
I wouldn't use it to save a few bucks on an indie title, but it's a nice resource when waiting for a AAA game to become affordable.
Looks neat! I didn't see Docker install instructions or even a link to the image on a registry, yet there is a Dockerfile. Do you support Docker-based self hosting?