$300 in LED mods? Definitely something I'd never pay for let alone want to own as I'm sure I'd need to buy sunglasses and play in bright sunlight in my driveway to compensate.
I have done LEDs on all 4 of my pins for around $65 average a pin; tastefully done besides; leaving some incandescents where they really looked better. Goal to bring out the real color in the inserts/combat fading, give pure cool colors (blues/greens) that incandescent couldn't do, and even amounts of PF lighting.
Typically 64 inserts at 28 cents for basic single LED to at most 89 cents each for non-ghosting triple bright SMD's ($18 to $57). Then 12-24 PF and 25-35 back box lamps if needed, @ 68 cents each = $25 to $40; for a grand total of $43 to $97. Add shipping, say $50 to $110 range for a full 'modest' LED'd game. And even with that, you'll be lucky to recoup 50% of that on a resale to most people.
If I saw $300 in LEDs, I'd not even consider purchasing the game because it definitely isn't going to look how I would want it to look.