Sure, if they ask, it is appropriate to say that the shadchan prefers money. However, if they don’t bring it up– yes, they really should be paying the shadchan, but it is not appropriate to ask for payment.
Also, I’m sure there is something in between “clutter” or a “candy dish” and a check for $1,000.
Also also, I would really be wary of making assumptions as to what the family does or doesn’t intend to do based on a vague comment made at the vort.