Firstly, people have been doing this privately for years – promising shadchanim a lot of money to find their daugter a shidduch. I am not sure why we need Nasi’s help here. I am annoyed that they still owe a lot of people money (including me) before the cancelled their previous program and they claim they can’t pay it. They are breaking a promise and I certainly wouldn’t trust them to hold my money in escrow.
Secondly, in my experience shaddchanim push younger girls because they are more likely to get married to the first or second candidate. I know this since I specifically state that I don’t want a “fresh off the boat” girl and I keep getting send those resumes. Older girls need their friends, relatives and neighbors to work on their behalf