What are names for a gold digger's man?
Solution 1:
A gold digger's man must be a goldmine.
Gold digging, engaging in romantic relationships for money rather than love
Gold mining, mining for the element gold
Wikipedia
Girl's got a goldmine and he's so fine.
Girl's got a goldmine and he's all mine.
Pointer Sisters
Solution 2:
Sugar Daddy
Not strictly one word - but a common term for a older, richer counterpart of a gold digger. Usually used for more willing participants - older men who are just glad to be dating someone more attractive and younger.
"Mark" might also fit - but is usually used to refer to the targets of con artists, rather than women dating mainly for material reasons, so I'd use in in situations where the gold digger is more predatory
It may be a bit obscure but "Ticket" - as in ticket to the gravy train
Solution 3:
In Eastern Europe — where I live — the term typically used is sponsor.