Crashanatum was dead from the start, miners made some cash but who paid it, I don't know.
As usual, those who were hoping SIGT would go to the moon. Except it didn't. Signatum is one of the examples how investing into mining hardware is so much safer than investing into coins. For every coin that goes up spectacularly (like BTX did) there's 5-10 coins that just go down.
You are right, it's safer to invest into mining hardware. But you miss all the profits by doing that. High risk, low reward...
You just don't invest to "coins" like btx or sigt.