I agree. Just scuff it up with some sandpaper, prime, paint and probably clear. It probably won't cost that much if you do it yourself.

EDIT: I think that area is not smooth but textured. So, not sure if sanding will make it uneven (and maybe create more work). If so, might be better to just give the area a good cleaning instead of sanding. I'm sure there are chemicals that you can use to help in cleaning and for primer to adhere too.

If you let a shop do it, I'm thinking maybe $150-$200? Just a guess.

For the front, you could think about adding the colored skid plate.