What's the problem in marrying for money?

There is nothing wrong with it. Gold diggers have existed since time immemorial.

Money can't replace emotional investment. What if his dreams, goals, expectations from partner are different? What if he feels superior and has self entitlement coz of money? How will you reach a middle ground during arguments or what if he expects you to sacrifice each time coz of money?
What if you create a dysfunctional family where everyday is toxic as hell? Think about the children you will raise.
Such marriages usually end up as platonic with zero emotional connection. Both partners try to find solace in materialistic things and Eventually cheating on each other to gain missing emotional support .
Money can be an important factor but not the basis to marry.

When you say the one I like, do you mean crush or boyfriend?