This is like the n-th thread that has popped up on VIX futures with the same questions. First of all, a search of ET threads would point you to previously discussed threads where people know what they are talking about explain the VIX futures.
Second, there is a ton of informtion on VIX futures at the website where they are traded which explains, settlement and how they are priced.
Third, the idea that VIX never goes to $0 makes it unique. ES theoretically cannot go to $0 but you can still lose your ass trading it if you do not know what you are doing as someone pointed out, they do expire and can expire at a value a lot lower than what you bought it for or higher than what you shorted it at.
Fourth, people continue to make the mistake that VIX futures track the VIX index perfectly. VIX can increase and the futures will not move at all since it is future expected value of VIX at expiration not necessarily the current spot value. VIX futures can trade at a discount to spot VIX. Lot of ways to lose money if you do not understand the term structure of volatility over time just like bonds have interest rate structures.