Hillel wasn’t let into the beis midrash because he couldn’t afford the fee.
As others have pointed out, putting it together costs money. There are also plenty of free shiurim, so it’s not as if they’re shutting you out of all learning.
Something to think about: we know how valuable Torah is – ???? ??? ???????. Why do we hesitate to spend money, and complain when people charge, for something so important? We wouldn’t say the same about paying for food, clothing, and housing, would we?