The argument is not "you could make money", the argument is that if you got the expensive thing for free and choose not to sell then you're roughly as "insane" as the person that paid full price. Go ahead and splurge but try not to be a hypocrite about it. It's not lmm that was passing judgement, it was the person that owns the record passing judgement.
It is a massive massive massive privilege of us here to even ponder keeping a record we bought for 2 which could be sold for 1300. For a lot of other population this would be not even an argument.
Again, I don't actually care, but I do believe that mathematically, if one starts with assumption / claim that buying a 1300 record is insane, not selling it is equally insane (or not;). Crux of my argument is that two sides of that equation are equal, not whether we should consider that equation or not. I find it dishonest to make one side of the claim, but go all "modern culture is all about hussle!" When pointing the equivalence of the other side of the claim.