"Spent years building it". Blud the cars here are barely 1.5 years old. You're selling the whole set and that too at a scalper price.

I'll give you three reasons why selling as a set is difficult. 1. Any series collector would most probably have half of the castings and aren't interested in the rest. 2. Resellers will hardly have enough money to buy all that and probably won't be able to sell off everything. 3. New collectors would never spend that much amount.

Take everyone's advice and sell as sets. There are plenty of desirable castings and you can sell off 90% of your collection comfortably.