I found in a local store a used -but in excellent conditions- TNF Summit Series Inferno sleeping bag. The size is Large and the price 99€. That's the exact same model that you can find on the TNF website for 900€, only it's a bit older (you can notice from zips, logo etc. but on a technical level is exactly the same). My question is, should I buy it as an investment and then try to resell it ? The closest Summit sleeping bags that I was able to find on eBay are selling for 400/500€ (tho they have a lower tolerance of "just" -20). There's a market for these things ?