I actually understand what you're saying and I kinda like it...
So right now rep is calculated with a simple formula: Rep+1 or Rep-1
This would basically complicate the forum rep. In simple terms if you have 75 rep, it will be Rep+.5, if you have 125 rep it will be Rep+.25 and so on and so on, basically turning it into a logarithmic curve, slowing down some of the rep numbers (Meaning you don't need to add more star colors!) And it would actually apply the other way too. So if you have super high rep and get dumbed, instead of being rep-1 it will be rep-2 or rep-1.5
Yay math coming from stupid person
Its complicated and makes no difference really. I think if anything changed about rep it would be expiring negative rep, because sometimes people just have a bad day