I agree with DaasYochid – more qualified Shadchanim would help.
I think that what “Ofcourse” is suggesting is that the wealthy people pay for full-time, professional Shadchanim. Marriage counselors make around $80,000 per year. However to be a licensed marriage counselor means you need to have gone to graduate school to learn about recognizing and treating all kinds of mental illness. Of course, besides training, experience is necessary too. I doubt that there are enough frum people with those qualifications to be hired to do this job even if the wealthy people could be convinced to pay for them.
The advantage of requiring that Shadchanim be marriage counselors is quite simple. The Shadchan would meet with the couple before/after dates and discuss what went wrong, what went right and would help them build (or destroy) the relationship. This would continue on during the whole dating process and for a few months after the marriage to make sure that little problems get taken care of before they become big problems. The marriage counselor could also intervene and get a divorce if there are “surprises” (addictions or whatever). This would be very expensive, but it would almost guarantee marriages that start out with a positive, healthy relationship.
Perhaps my standards are too high? As the standards are lowered, the rate of successful marriages will go down too. At some point during the process of lowering the standards, you wind up with Shadchanim who are bored housewives and whose motivation is something other than money.
DaasYochid, please define what you mean by qualified.