Okay, this is something I never got.
Companies have gone out of their way to make games playable on other systems they're not supposed to be playable on: The retroport for NES to SNES and the retrogen for Genesis to SNES are so common you can buy one off of WALMART, and someone even shoved a gameboy in a NES cart!
So what's got me confused is...why the heck hasn't anyone made any generic power base converters?
It's literally nothing more than building a connection with a different sized slot; SMS games ARE supposed to be played on a genesis, as the hardware is already there IN the genesis, so costs for manufacturing would be super-low. It's pretty much the same thing as the GameGear Master Gear, except WAY more useful and practical (actually playing SMS games on a TV screen instead of a tiny GG one).
I'm sure there's a lot of people who'd happily plunk down a $20 for a generic version of the PBC to avoid the hassle of using a master system to play SMS games or just save space/hookups as well as enjoy the audio upgrades the genesis hardware gives for a select few titles.
It's also likely there's likely more people who'd buy that than a generic master gear for the same price (more genesis owners than GG owners by far), and WAAAY more people that'd buy a generic one than spend crazy money on a SEGA official one if it worked just as well (and it'd have no reason not to).
So....why hasn't it happened yet?