I have more money than sense...but $90 for props I consider over the top.
I just dropped ~$600 for an FPV setup, so I'm NOT adverse to spending money...I'd just like to know how a pair of screws (cause that's all they are!) can cost $90.
My FPV purchase comprised Fatshark Attitude goggles and battery pack, Imersion 5.8 Ghz Tx with a pair of Blue Beam Ultra antenna. Probably gonna need to source a GoPro to Imersion cable unless I opt for a cheapo on-board camera and record the flight through the Fatshark output, which I think I can do...but here at least there is a TON of technology that gives value. I could always sell the FPV equipment and get most, if not all my money back. Not so with $90.00 props. Not much of a market for used $90.00 props that don't do a darned thing better (that is perceptible or meaningful) than their $20.00 brethren.
My $.02
PF