Vests represent the "voting power" you have... The more STEEM you have powered up, the more voting power you will have. However the actual value of your vote however depends on two things completely

I have noticed the value of my 100% vote go down over time... I mainly powered up to able to promote my photography: with all the traditional social media having retarded algorithms or expensive advertising,

SBD went up?! Again? Some people don't understand that volatility works both ways: you tend to focus on the price drops, but inexplicable rises are also possible. Although in case of SBD, it was pretty

SBD? The two currenccies used on and issued by the steem blockchain are steem and SBD, whilst the use of steem is fairly clear: you can “power up” and make more by curating, the usage and need for SBD