Elsewhere, how much would you spend on coaching to get an investment banking internship? Before answering, you might consider what the sum might be as a percentage of your expected earnings (including from the internship itself), whether your preparation and contacts would be good enough to get one anyway, and what the employment market is like where you live.
An increasing number of ambitious Chinese students are getting an answer well into five figures. And some of them seem to be getting value for money; a 21-year-old interviewed by Bloomberg spent $35,000 with a careers agency but ended up going to 11 superdays and getting three offers from bulge bracket and boutique firms.
https://www.efinancialcareers.com/news/accepting-investment-bank-offer-internship