Good job I haven't got an Everdrive MD, Turbo Everdrive 1.2, 161-1 MVS cart, Super Everdrive and a NES 40-1 - Ohh wait I have.
I do have lots of original carts so I don't exclusively use the Everdrive's.
Also what's the cost to replace a Megadrive/Genesis console, or Snes or NES via the money saved on expensive or unobtainable games? Ive got at least 4 MD's, a couple of NES's, 3 Snes's and even two MVS motherboards.
Interesting read but some consoles biggest issues are with old unstable power supplies, caps that need replacing, damaged edge connectors, faulty carts and previous modifications.