Then the collectioneur at heart... just collecting things they really appreciate and by buying giving things a value... Could be discussed, but by bidding and buying they set a standard for certain objects ...
This intention appeals more to me, i do not think some of the rich people who buy these collectibles actually want to sell it in the future, for example, if bitcoins continues to grow like it is doing, then this "buy bitcoin" sign might be worth more than it was bought for in the long run; but i don't think most people who buy these historical items think like this.
They basically want to hodl a part/piece of history and i am pretty sure that is so much of a good feeling, of course one must have the money to buy and own it, but the end goal is prolly not to make more money from it later on.