Actually it's not that hard at all to repair it yourself.http://weightweenies.starbike.com/forum/viewtopic.php?f=3&t=53264
I use coarse wet sanding paper first (#180) followed by the finer grit ones, #400 and #600 until the transition between the damaged area and the rest of the lever is no longer felt when you run your finger over it.
Make sure everything is dry and clean, than use some alcohol or other degreaser to further clean the lever.
Mask everything that does not need a coat thoroughly.
Beware that the propelling gas from the spray can will drop on just about everything near the painting area. So if you do this with the shifter still on the bike make sure to take proper precautions. The stuff can be removed but it can be time consuming to do so.
Best practice is to use several thin layers of glossy clearcoat with enough time inbetween so you can correct mishaps as you go using fine grit sanding paper. Once you're happy with the result let it all dry for a week or so. You can shine it with some polish if you like.
The endresult should be indistinguishable from a new lever which is certainly possible.
Personally I don't use nailpolish as it tends to dissolve in some of the chemicals I sometimes use to thoroughly clean the bikes.
Besides that I also find it to be too easy to spot as a "repair" area. (May be my own fault, dunno.)