It all depends on the standard you want the end product to look. There's a lot of time and consumables involved in doing the job properly and detailing is a dark art which very few people actually know exactly what they are doing so go on evidence of work/recommendations. When I ran my own business that would have been atleast £250 just to do the paintwork and if I didn't wantto do it then the bill was extortionant so they either paid or went elsewhere which suited me fine as some people expect miracles but at the same time I never once had a complaint