Buying a ROM would mean buying a ROM. As in, you get the .ROM.

Steam DRM by the way is trivial to bypass. From Steamworks documentation:

> The Steam DRM wrapper by itself is not an anti-piracy solution. The Steam DRM wrapper protects against extremely casual piracy (i.e. copying all game files to another computer) and has some obfuscation, but it is easily removed by a motivated attacker.

Of course some games have third party DRM, and in the store it will tell you that before you buy it.

But the problem is not the DRM here. Your average gamer wouldn't care about a non invasive as long as they could get the same or better experience than they can now using a pirated ROM.