I agree with all your points, but it's not really resale value I'm concerned with. I'm more concerned with at least getting more than 1 year's worth of use out of it. In reality, I've probably flown a grand total of 15 hours....in little 15-30 minute spurts here and there. So really, that's not a lot of use.
And FYI, I just sold my 5 year old Canon 5D MKII for over $1000, just about 50% of it's new value over 5 years ago. My 1 year anniversary with Solo just passed.
I hear 'ya, but short of a crash, there's really nothing that should wear out that's not replaceable. Bearings or whole motors can be replaced, the ESCs should last forever, I'm sure they're sufficiently overrated that they're not going to wear out from basic use. So that 1 to 2 years was, I think, an extreme. I was just saying if it was grounded within that time, I still think I would get use out of it equal to what I could sell it for today.
That's pretty good on your 5D... I have the original, just before they added video to them, and at one point I considered selling both it and my 20D to get a new 5D MKwhatever, and I don't think I would have netted more than $500 between them. I still have a D60 that I'd have to pay someone to take! But even that, I keep in case I want to do some time lapse and don't want to put thousands of shutter releases on my 5D.
But again, I feel your pain. I just think there's there's little point offloading the Solo now. They still fly great, there's a few minor bugs in a few minor features, but all the main things work great. If you're concerned about parts, buy a few spare motor pods, or look out for someone else selling for $300 and pick up an entire spare.