You, sir, are completely incorrect on this. I'm one buyer who would gladly pay for mods. My Congo has a $200 topper, a $175 shaker motor, $200 worth of LEDs, an LED OCD card that's $150, Flipper Fidelity speakers, a $300 powdercoating job by Matt at BackAlley, and an alternate translite so I don't have to stare at the horrible one that's stock. If you don't think all of that is worth another $1000, then I'll keep my beautiful Congo while you continue your search for a piece of shit. But it won't be the same experience as playing my machine is. Guaran-f**king-teed.
Oh...I almost forgot: Mine has all new ramps and new window...about $500 in new stuff in the game. I suppose that doesn't add value either.