And "routed" means, put on a vending route at a location somewhere.
Home use only basically means it was never in an arcade, bar, pizza shop, or whatever--it means it was used in home for its entire life, and not just after it was removed from a location.
Condition is a big factor in pinball machines, just like any collectible item. Typically, games that were ever only used in a home are typically in very nice condition, with no wear or fade. Games that were routed typically have wear and fade, like this one does.
Collectors do generally pay a premium for games that are in exceptional condition, but games with wear, fade, and unshopped will usually fetch a lower price. (And "shopped" means the game was cleaned up properly, new rubbers, circuit boards repaired/bullet-proofed, broken parts replaced, flipper assemblies rebuilt, coil sleeves replaced, bulbs replaced or updated to LEDs, and anything else repaired/replaced that needed attention. Most of the pinside ads were for games that were recently "shopped").
The game you listed was a little above the average price for this title in this condition, has tiny low-resolution photos, and was posted from a new account (all three factors led some people to think it was a fake ad), which is why you had several people not take the ad seriously.
Posting better photos at full size would go a long way to help improve your ad.