The Red One wasn't a worthy investment when it was brand new.
That's an undefended, ignorant position. Blanket statements like that are unhelpful, and when I see so little information added to that kind of "opinion" I tend to guess the person making the statement has no information to back it up, just a bunch of FUD they read on the internet.
Those who adopted early made a ton of $$ on rentals and made all of their money back, then had an outrageously generous trade-in to Epic. Now, people shoot beautiful things on Epics and Red Ones that can look just as good as Alexa and F65 in the right hands. (NOT in incompetent hands that do not understand raw post and grading)
That said, I think technology is moving so fast now that buying any camera may no longer be a wise investment. It will loose too much value too quickly, so no way for 90% of buyers to recoup in time, not even quite busy ones. I guess we are shifting back to a more rental-oriented model.
6 months ago the Epic sold for $34 500 - now it's $17 500 - to have made that much money in rentals in such a short time, you'd have to be pretty busy, or a dedicated - and very popular - rental house. Brain only in our market rents for about $500 (more for a full package, I'm saying just the brain) so that $17 000 in lost value = 34 rental days, or 11 "3-day weeks" within just 6 months. I can tell you that we were NOT that busy.
Most people would be far better off renting for the number of shoot days during that period when they needed the camera, especially those doing ads/corpos/music videos where there is a lot of prep and selling time vs few actual shooting days.
Also, by not owning any camera, you can rent whatever si truly best suited to each individual shoot day. Oftentimes that may well be an Epic, other times a Phantom, other times a C500 for ultra low light - each gig is different.