To ones liking or not just watch one Rock Island Auction. Provenance to a historical or well known person will 100% increase value. Depending on who the person is. This is not disputable. Buyers do pay more for provenance, condition and scarcity.

May not be the best example of a what if but…
If and when RM Reg #1 ever shows I would love to buy it for the cost of a normal like condition RM but I don’t think that will be the case.