I was really big into games as a kid. I played the following systems (listed in order of time played): SMS, Genesis, Atari ST, SNES, Atari 2600, Intelivision, NES, Old DOS games, Pong (not joking), Game Boy. I've spent very little on any newer systems.
In 1999 I did tech support for Microsoft. They had a library that allowed you to check out any computer book or software. I tried to teach myself web design. The first website I made was an emulation site called Super Roms. That is where I learned about emulation and I was hooked on it. The concept of emulation really fascinates me.
Years later I made arcade machines. From the outside they look like regular arcades but inside is a computer. They emulated about 10 game machines and played over 10,000 games. I made a website to sell them. I sold about 5. They were a lot of work - construction and carpentry stuff that I am not good at. I put
David de Niess' NEScafe on a side page of the site. It quickly became more popular than the rest of the site.
I then redesigned the site several times getting it to what it is today.
The site is based on retro games because: I know little about newer games. I do not enjoy newer games. It technically is not possible to emulate newer games online well. I think a game site with games that are still being produced would not be the right thing to do. Playing the original Metroid online might inspire you to buy the new Metroid. Playing the new Metroid online would probably have the opposite effect. (though I do think modern game companies should find a way to offer online demos in the near future)