I must live on a different planet. I earn a very good living, but there is no way that I would ever pay $2K per month so that a son in law could sit in kollel. (I have girls that are approaching the age.)
My kesuba says that I would support my wife, and I expect that my son in law will support his wife. Just like the vast majority of Torah Jews (including rabbanim, chazal, etc.) of the past. This modern idea that a young man shouldn’t earn a living is beyond absurd. It’s horrible middos.
Indeed, if someone came to me with a shidduch for my daughter that included a demand for money, I would tell them to get lost. I’m not interested in a son in law that has such low values that he would date my daughter only if I promised money.
Since I earn a decent living, I would be happy to help my children if they need it. But the idea is that they would do their best, and I would be the safety net. It’s b’dieved not l’chatchilah.