I don't know if the fact he's financially successful affects my read though. It's certainly obvious he had money but unfortunately I don't think the money precludes an unhealthy obsession. Infact it might make it worse.
Worth noting that the £1.5 million valuation is in the ball park of what the building is worth on it's own.
I think the parent's point is that while the collecting itself can be very rewarding it's far from guaranteed anyone else will find value in the collection. It does feel a shame to dispose of such a piece of work, but the real value is likely more in the collector than the collection.
It is perfectly possible I got the wrong impression here. I don't know him. All I can be sure about is that this was the impression I got reading the article.