Noo, Don't SPEND rep, I work hard for mine :P
+ what would happen to mattnz?
HERE ARE MY IDEAS. HURR.
A Milestone achievement system due to posts would be good, possibly Posts x Karma , With an equal system for negative rep, So people who strive for negative rep will still achieve the same, but evil doer's with say, 100rep who gets a neg rep would suffer, where as someone with -400 rep, who gets neg rep would benefit.
We COULD have a currency, originally made of Posts x Rep, but could be slowly depleted without the actual posts or rep depleting. The points would have to be based off Posts, with the rep being multiplied to the end result.
in this next example... 100 rep will be equal to 1.
So if you had
10 posts
100 rep
you would have 10 points. (10x1)
You spend 2 on a custom title for a week
You now have
10 posts
100 rep
8 points
but then I rep you for posting that funny picture in Random Images.
But say I was a rep giant and repped you by 19 rep.
You have
11 posts
119 rep
and now we have 1.19 x 11 = 13.09
Rounded down, thats 13 (herp derp)
minus the 2 points from that spend, and you have 11 points. thats 2 extra points :D
and just to do another example
Someone else (who is also a rep giant) reps you 19 again, whilst you have the same amount of posts.
You now have
11 posts
138 rep
Your points are now 1.38*11 = 15.18, rounded down, 15.
annnnnd minus the 2 points from that spend before, you have 13 points. Without posting, your points have increased.
How this will work the same way with negative rep? no f**king clue.
BUT THOSE ARE MY THOUGHTS.