Well, no one gets any notification about a mod changing something on a user's profile, so unless you keep track of everyone's exact experience levels and use the formula to calculate whether said user has additional EXP, you'll never know, and it'll be hard to create a drama about it.

Besides, it's not like we're going to give anyone several EXP levels of bonus, all we will do is add just a little bit of EXP, to award the user for his/her good deed.