Will somebody be so kind and explain to me where $$$$ comes into the shidduch picture? You wanna marry the girl, or not? How does a house or no house change anything about her?
The Roshei Yeshiva decided. It is a simple formula:
1: In order to become a Gadol, you need to learn without outside worries
2: In order to learn without worries, you need to be fully supported (preferably money in the bank, ready to be transfered and agreed upon even before the shidduch is even looked at. What happens if C”V the FIL loses his money? It is grounds for a divorce!).
3: The full support should be done by the father in law, as payment for the Zechus that his daughter gets to marry the budding Talmid Chacham.
4: (And most critical) Everyone is a Gadol Hador (Otherwise, they would have no right taking money for learning), or is at least a potential Gadol Hador, or massive Talmid Chacham.
Therefore, everyone who wants to learn deserves full support. Go to the Lakewood Roshei Yeshiva, that is what they will tell you (and if Joseph was here, he would say the same).
Simple logic will suffice.