I don't know, 10 mil on the off chance that you lose the dms, during a seize, gun glitch, medic not being able to make it in time. I can see it's rarity, but I can also see the risks and loss. Reason I said 5-6 mill is because it's in reason, and the players will increase the price gunning for it up to 10 mil. Going high off the get-go kinda makes them think is it worth it?
Should start at 5-6 mil (More practical), it will raise itself. Having a DMS scope makes fights interesting but also brings the risk of having one. Don't go too high on the start if your trying to advertise to the vets.
If you experience any issues, post a reply in that link so Bohemia will know it is not that effective . Some players have experienced less texture drops then normal.
When it was a thing, you had to shoot the tear gas on the 'ground' next to your target in order for it to work. If the target was exposed to the tear-gas, his screen would get distorted. It was nice when it was around because it provided a happy medium against those that like playing 'peek a boo' for hours on smaller platforms such as deerstands.