I have 10 guitars, and most of them cost more than my FX3, and a couple were more than the FX3 and FM3 combined and, oddly, I never once wondered what they’d be worth in 10 years.
I didn’t buy this gear as a financial investment, there are many better ones out there, but these are an investment in myself. I will say that the rate of improvement in functionality and quality of sound we have because of the steady stream of firmware updates keeps raising the value of the FAS modelers, and is unmatched by their competitors.