People love to say "mods don't increase the value of your game" when what they mean is "mods don't increase the value of your game to me." If you don't like mods, don't buy games with mods (or make a lower offer to the seller including a term that they get to keep X, Y and Z mods that you don't like.) But for most mods, there's a subset of buyers out there that'd be happy to pay some percentage of the original cost of the mod (perhaps exceeding 100% if it's difficult to install) in addition to the value of the "bone stock" game. If you ignore that class of buyers you end up with a distorted view of the pinball market.

This post is not an endorsement on the pricing of this game, no interest in engaging on that issue. It's just annoying when people pop up with a knee-jerk "your mods are worthless" response to a heavily modded game. Your preferences do not necessarily reflect all potential buyers.

If the "opinion" is whether mods look good or are worth paying for, I'm not looking to invalidate it! I like some mods and dislike others, and weigh my interest in the installed mods before making an offer on a game just like anyone else.

My point was simply that the statement "mods don't increase the value of your game" is almost always objectively false. The game's got extra bits on it that are worth money to a subset of pinball buyers, and that's all it takes to increase the market value of the game. If you don't like mods you may chose not to make an offer (so by modding his game OP probably reduced the pool of potential buyers), or you might make a reduced offer for the game with mods removed (which acknowledges that the mods have some value), or you might buy the game at asking price, factoring in what you think you can sell the mods for after you strip them off.

If the "opinion" is "mods have no value to me" or "a heavily modded game can be tougher to sell" or even "it's rare to recoup 100% of your mod costs" then I've got no objections. But you frequently see blanket statements that mods add zero resell value to a game, and that's just silly.

Is that a trade offer? I think you're late, he already sold the Congo.