Think of it from a clients point of view, If you went to ask for a price list and it has been tip ex, what would come in to your mind straight away? And what kind of impression do you think that portrays about your service?
People are judgemental and if they see that they might assume that you offer a cheap service. It will look even worse if they manage to scratch it off and see the real price then that would look like you have deceive them.
They say first impression last so you don't want to create a negative impression. If say you got some flyer and business cards done and it cost you £100, it might sound a lot but what are the implication if you don't change the price list? I am sure you will loose more than £100 worth of business if you tip ex the old price list. If you want to say money then there an online printer called saxoprint, they are the cheapest i have seen and it will take about 5 workings for the price list to be printed.
If you want to charge people more money then you have to look professional, I don't just mean your treatments but also in your advertising/marketing. If you need to get your price list done then someone in here does create them for a really good price, I think his name is carl. Just do a search on the forum, I think he has done a few peoples logo in here.