Honestly, I think the market is at a point where we might see prices start to quickly drop on these cameras. In my opinion, there are just too many out there for the available work. Many RED owners may use their cameras for a pet project or two, but don't have any reasonable expectation of renting their gear out; so once the pink cloud dissipates, and they realize that they have a lot of investment just sitting there not amortizing, they may want to sell. When that happens in big numbers, the prices will drop quickly.
Maybe really early serial numbers like mine, #30, will keep a little extra value because of their place in line for Epic trade-in. However, I don't think later serial numbers, will be worth anything in this regard, when new ones can be had from RED with full warranties. Also of note is that RED now charges $1,250 to change ownership with only 90 days of warranty. Naturally, they would like to encourage the purchase of new cameras.
Anyway, those are just my random thoughts on the matter, but it is the market that will determine prices. In the meantime, I'm still looking for a few more REDs. Please e-mail me for more details if you have any interest. Mathers at DigitalCinemaSociety dot org
Please note: I don't often check for PMs, so e-mail is best.
Digital Cinema Society President
Studio City, CA