I used to have a B7 Avant and have decided to buy an S4 Avant as a daily drive . I have just been to see one (this was a B6 2004 but I have a budget that will stretch to 2010 B8s) and all was ok until I checked the front arches. All rust around the edges and not a just a little, paint bubbled and flaking

I expect this is a common problem in older versions of the car. I could always repair or replace arches but that obviously ramps costs up.
What are people's thoughts on this issue?