Show promoters and talent buyers don’t work on a volunteer basis. Sure, they probably got their jobs because they have an interest in music, but do you know what they love more than music? Being able to pay for health insurance, eating out every now and then, and having a roof to sleep under every night. If you don’t bring people to your shows, the venue won’t make any money, and there’s only so many favors you can expect them to do for you.
A quick YouTube search shows that there are hundreds of thousands of chiptune covers, ranging from meticulous recreations coming from actual consoles to basic MIDI files loaded up in a modern DAW and run through simple “8-bit” plugins.