Just to be clear, a shadchan can very easily ascertain the financial support issue prior to setting up a date. In interviewing a girl’s parents, one of the questions should be, “What is your position on your financial support of the couple while the boy learns fulltime, for how long are you willing to give the support, and what is the scope of that support, if any?”
I see no issue with that at all. It’s a fair querstion, and it avoids redting shidduchim that l’chatchilah will not be pelasing to the parents on either side.