I've never been in one but I can help explain their benefits.
You are paying a hefty fee to the frat. That money is gonna go towards events and expenses that help network your chapter. You're essentially building connections and opening doors with money and a "brother/sisterhood" that'll help you in the long run depending on what field you wanna go into.
You'll typically find a lot of business-centered frats.
Not all sororities and frats with be those typical tv show frat house, throw events, and party type frats. But some are very >.> elitist. Not all.