Stax uses around 60% of it's daily voting power for vote swapping and self voting before 1 of it's members is upvoted. I recently wrote a post about it, STAX has roughly a -60% ROI compared with leasing the some SP out. It's been lining the pockets of the owner for over 18 months in a really nasty way.
And FYI, silvergoldbotty has no connection to any silver and gold stacking community on steemit. Stax started out as a community bot which the whole #steemsilvergold community pumped, upvoted and some even made large STEEM donations. After a few months, the owner of the bot decided the account was his and he owned the wallet. Stax was kicked out of the #steemsilvergold labeled a thief.
Since then, it has been on a slow decline using all it's voting SP for things like SBI vote swapping. The fact that the bot is a futured member shows the level of greed the owner of Stax has.
My 2 cents
https://steemit.com/upvote/@steemcryptosicko/calling-out-all-members-of-silvergoldbotty-aka-stax