I notice that they are much less liquid than futures. When you look at the spreads, I often see bid and ask, and amounts, that can be wildly different from "last" - sometimes because the future has changed in price, sometimes not. I also see that often, despite bids that are not too far apart, there is no actually buying and selling taking place. So my questions are:
1 - How is it that there can be so few "last traded" even when there are bids?
2 - It appears after hours options are slim to non-existant. Is that normal?
3 - What are very outlandish ask/bids for? Stink bids people put in?
4 - What dangers exist when buying/selling? How do I know what the "real" value should be when there is little liquidity?