The pills at the bottom are an indication of how far towards the next rep power point you are. The stars and what not above are for having reached a certain level I never quite have been able to decipher.
If a couple people with a rep power of, say 100 rep you, you will see more green pills, but your rep power likely won't change.
If someone with about 6,000 reps you, you will see your rep power rise by 6 (1,000 rep point = 1 point of rep power.
Neg reps are half value, so logically, you should normally go up in rep power even if you get the occasional neg rep.
If you find your rep power going down, you have obviously made some enemies.
Pay attention to the Members who show red bricks and splats and a rep power of zero.
Avoid their mistakes.
It's also not a bad idea to lokk skeptically on those who opt out of the rep system.
This is true. I believe that no one should be able to opt out or to turn off rep display. Reputation is the only measure a new member has to judge the credibility of a member here.
Since the option to opt out became available, just one person opted out for altruistic reasons and she has decided to return to using the system.
USMB has a half dozen fairly regular members who were allowed to opt out once they had received 2, 3 or 5 red splats and another half dozen who have not opted out, but have simply turned the graphic display off.
So, what we now have is a dozen people who hide behind the board software so that it is no longer instantly apparent how they are regarded by their peers.
I say ALL members who have opted out or turned off the display should be returned to "in and on".