OP, you sound extremely ignorant and uneducated.
Even with a significant discount, the UK would still benefit greatly from attracting more international students.
First, they don't take out UK student loans. They either pay out of pocket or use loans from their home countries.
Second, they spend a huge amount of money in the UK: renting accommodation, eating out, shopping, and using local services.
On top of that, their families and friends visit for graduations and holidays, bringing even more money to hotels, restaurants, and the wider economy.
I really struggle to understand how you could think this would hurt the UK in any way, unless your objection is simply that you don't like foreigners, which comes across quite clearly from your comments.
Maybe travel a bit or talk to people from other countries. You might be surprised by how much there is to learn.