Read
this to learn about SIG campaigns
1. If another user has some signatures is there a way to see how much the user has earned from the sigs?
Should you feel the need to stalk a user you can go check the thread for said campaign and check the spreadsheet this will track the payments for a particular campaign usually from start to finish. Although I'm not sure wht business it is of yours.
2. Are higher ranked users, Legendary, Full Member, Member, paid different rates for carrying the sigs?
Depends most pay different rates for ranks, some even have a different rate for Merit earned. This is usually outlined in the SIG campaign OP.
3. *snip* and had his username hijacked, and the hijacked username now has a string of sigs, and the ethernet address posted shows large amounts of eth moving through, is there anything the real owner of the username need to worry about? If he's in another time zone on another continent will that disrupt my sleep or would that be something to do with the large amounts of eth moving through?
If the hacker was dumb enough to continue using the same address, then great for the person who got hacked. And any large ETH transaction will wake you up in the middle of the night, regardless of proximity to a computer or internet or any sense of reality.