Here's my opinion on selling used parts like this and PLEASE take no offence to the original poster.
First off, if you own a Cuda or Challenger chances are pretty good it already has door handles. I have seen a few over the years that break and would need to be replaced, but they are few and far between.
Therefore most people who want to replace their doors handles usually do so because they just spent lots of money on a paint job, now their 40 year old handles look like junk. They really aren't going to look for a "better used" set.
I have litteraly stacks of used E Body door handles that I put out on my $2 tarp everytime I vend in the Spring and still nobody buys them....I've had people pay me $2 for one, remove the plastic clips then drop the door handle back on my tarp...
Now comes the double edged sword....In today's day and age more and more new reproduction parts are coming to market which is really good for the people restoring cars, but real bad for the people selling used parts.
I took 15 seconds out of my day and found these door handles, brand new on EBay for $90/pair. from Dale's Cuda Shop,
http://www.ebay.com/itm/1970-71-72-73-74-Cuda-Exterior-Door-Handles-NEW-/280917824900?pt=Vintage_Car_Truck_Parts_Accessories&hash=item416801d584&vxp=mtr#ht_558wt_760 well known for making some of the best handles out there. So why would anybody buy a used set for $40-$50
Jules,
RIP, used to buy used 70 Challenger ones to restore for customers wanting original parts, but even he stopped that after DCS brought out their curved handles....
You see this time and time again as more reproduction parts come to market.