Everyone knows what karma hits are for.
When you give karma to someone, you have a choice to agree / disagree with them, or green / red them, respectively. If you agree with their post, i.e. they say something funny, interesting, something you like, they complimented you, they helped you in any way, you can reward that post with green karma by agreeing. You can give them up to 100% of your karmic power (i'll talk about that in a minute) if you are a non-plat member. if you are a plat member, you can give up to 110% of your karmic power. COTB members can give up to 200% of their karmic power. You can also red someone by giving them red karma, which would take away from their karma and show up as a bomb if they are a non-plat member, but would just take away from their karma and sit in their k msgs if they are a plat member as well. you have the option to give red karma when the poster says something you disagree with, something you find offensive, something mean or nasty, etc...
Now let's talk about karmic power.
Karmic power is technically your e-power, or how much a member is able to give or take from another member in terms of karma...this increases as your karma value increases, as your number of posts increase and depending on whether or not you are a plat member. With every 500 posts, your karmic power increases by 1. as your karma increases, you karmic power increases significantly.
the more karma + karmic power you have, the more fun you can have on the forum by bombing, platinum bombing, blacking out members, giving green / red karma, donating karma, gifting plat membershsips, etc...
so you see, karma has it's value in the e-world.