But if everyone's opinion is equal in value, I don't get what the purpose of having different numbers is? There's no use for it. What added benefit does having +/- 2,3, etc. provide us that just having +/-1 wouldn't, if you're claiming everyone's input is equal? There's no use for it.
Then what is the meaning of having different levels of rep (2,3,etc.) if no matter what number you leave it all comes down to the simple idea (good or bad)?
I think you misunderstood. I'm saying just because your number is bigger your opinion isn't stronger, its not the same thing. You can buy the right to give more rep and it doesn't reflect your opinion strength. It's just a reward for helping the forum out.