There's a guy in the model club I used to belong to who (20 years ago!) claimed to have at least 4,000 models in his stash. At the time he was in his 50s. I saw him with a table at last year's MosquitoCon trying to sell a biiiig pile of them.
That'll probably be me in a few years, and I only have about 1500. I KNOW
I can't build them all before I croak.