First of all, do you actually know of a Shadchan that won’t redt a shidduch before receiving 10k?!? I highly doubt that! I’m in this field and I’ve yet to hear of such a price!
Second of all and this is my main point if what you say is true.
Question: Ever thought about why they might be doing such a thing?
The answer is pretty obvious and is also the real thing that you should be calling ‘Chutzpah’ and ‘Mind Boggling’! How many times does a shadchan work on a shidduch for hours and days and barely gets a thank you, forget about any compensation at all?!? How much does a Shadchan get when he/she actually is successful?!? Yes sometimes nicely, but at least 50% of the time, one gets very little compared to how much work and effort went into it. The shadchunas people give these days on a whole is TOTALLY unacceptable!
Can that maybe be a reason why a shadchan would take money like this before redting a shidduch? Of course!