I sold the 100's for $800 a few months ago.
I decided to list the 80, 85 and 95 for $2/pound on Facebook Marketplace and got a lot of interest. I eventually sold 680 pounds for $1360 (Friday morning). My return on the 1050 pounds I bought was complete, with some money made in the process.
The buyer was planning to blob them. Keeping a set for himself and flipping the other half in the secondary marketplace. I was actually surprised when I saw them for sale Monday morning for $1000 (about $3/lb) for the 10 blobs weighing about 340 pounds and then marked pending within hours. I feel like I missed out on an opportunity, but am happy that the seller was happy.
For his end, he probably took them to a machine shop, spent maybe $100 and had a near full set for himself for less than $500.
Interestingly, the last time I sold a spare 40 pound roundhead, the buyer was a climber who intended to blob it.
In all likelihood, my 60 and 75 pound roundheads will go that way as well. (UPDATE 9/22/2023 - Sold 60 and 75 pound dumbbells for $270)
Now, would like to finish a 1-50 set when I find a pair of 45s, but I am not in any hurry.