The administrators identified 377 ballots and associated memberships as fraudulent. Assuming all fraudulent memberships were new, the minimum cost per voting membership is £45 [1]. Total cost assuming no additional undetected memberships: £16,965 or just under $22,000 at current exchange rates.
Unfortunately current discussions of the marketing value of a Hugo Award have been somewhat drowned out by those who think the fan value of a Hugo is not as high as it once was, but it's not an influential award; if it's true that a Hugo Award for Best Novel generates a thousand or so additional sales, it's hard to make the economics of buying a Hugo make sense.
[1] https://glasgow2024.org/for-members/memberships-and-tickets/, WSFS Membership.