Why is there an entry fee for the alumni of SJOBA and additional charge of +1, while it’s practically free entry with free food at practically every other Alumni party in Tricity schools/colleges and infact Panjab University too?

Why is there an entry fee for the alumni of SJOBA and additional charge of +1, while it’s practically free entry with free food at practically every other Alumni party in Tricity schools/colleges and infact Panjab University too?