That was my plan.
I used to be a real gadgetfreak, buying something new every 1-2 years, then selling it online, for about 50% of what the gadget had cost new. Depending on how old it was and how well it looked it could be more or a bit less. The Ambit is an exception, it looks new, but will fetch only 20%.
The more affordable units Ambit 2S/R came out, so people can get a brand new unit with full warranty for 50% of the price the Ambit was 2 years ago. Besides that, it is always hard to sell items with rechargable batteries in them. The next owner can't know how well or not you cared for it, or how many charge cycles it has gone through.
New gadgets are unpredictable: functionality is more and more defined in software/firmware and thus subject to change anytime. There are important dependencies on websites (Movescount), they can also be redesigned/changed anytime. At best, a gadget gains functionality that you want, as more updates are provided, at worst, it loses just that one bit of functionality that you absolutely need.
I had Suunto's reputation of making high-quality, durable devices that lasted forever, in mind. I assumed that the Ambit would get a reasonable price after 2 years of use.
This error of judgement was entirely mine of course. I only looked at the benefits of new technologies (updates implementing more functionality later, no more changing of lithium batteries) and not at the risks. It can, in principle, happen with any new device. Be it a Polar V800 or a Garmin Fenix 2 or anything else.
As a budget-restricted gadgeteer I have to be careful. If there is a big chance that a gadget loses its value very quickly I will not buy it. This I have learned the hard way now. It will probably not stop me from buying gadgets in the future completely, but for now I just don't find it fun, and my budget its gone anyway.