Owning 2 connected effects boards was overkill. It would have required purchasing 2 separate gig bags, most likely custom pieces. My mindset has mostly been to own the most cost-effective units, with least carrying weight that would fulfill my needs.
The Duo 34 board and EV-1 expression pedal is still in my household. Only the Duo 17, FM3, and FC12 were sold.
I realize it sounds foolish, but the FM9 is the same size as the FC12, which means the FM9 will fit perfectly on the Duo 34 board with minimal adjustments. That means when eventually open-mics return to our music scene, all that will be needed is a Duo backpack, a guitar case, and a FRFR108 gigbag wedge. One trip I/O. Faster set-up / breakdown time. Fewer trips to the bathroom. (Well, if it weren't for my diminutive bladder...I'd not need worry...)
I did the math. After eBay fees, I netted about 77% of MAP price. That's really not that bad, when many times used gear sells for less than that. In fact, that's the best return I've ever had selling used gear. TBH, I wasn't looking for profit, just a quick sale before there multitudes of FM3 owners do the same thing and try selling their gear.
I chose to sell early on eBay because later would have driven down used prices with FM3s all over the place on Reverb. That, and new FM3s will be available new again in a week or so. And TBH, folks are asking much more for their used pieces than when sold new.
Being competitively priced guaranteed a quick sale. My feeling was that if I were trying to maximize profit because of blatant greed, only a desperate person would buy an overpriced unit. I was neither greedy nor desperate, but I don't condone the folks who are asking $200 above new MAP price for used gear. There may be actual buyers who will pay that overseas, but that was not what my sale was about.
Am just going to let things ride for a time, and wait for my FM9 purchase invite. When that email arrives, you can bet your bippy my CC will be purchasing quickly. I'm just hoping I'm not stuck at work when precious time waits for no man.