As others have said, education of what you actually do to the car is crucial. Knowing your competition and what services they provide and then explaining what makes you different is key. I have customers that ask what I charge for a wax job, and I tell them I don't just put wax on a car. I explain to the customer how I hand wash the car, clay bar the car, polish the car then apply wax. You then tell them how you don't just vac the interior and wipe some cheap shiny stuff all over the dash. You then properly clean every nook and cranny with brushes and q-tips then apply a factory finish conditioner for just a little more money than those guys down the street who do just wax the car and you look like a hero for not charging more!
Selling high end audio/video gear for 17 years has taught me that knowing your product, knowing your competitions product and why yours is different/advantages of yours, knowing common customers concerns so that you can overcome them and minimizing drawbacks(ie Price too high). For an example-you can buy Home theaters in a box at Costco for $400, but systems at our store start at closer to $2000 and go up to over $500,000. When you tell customers the difference between them and explain to them why they would benefit from those having one of your systems and what is bad about their systems, you look like a hero from saving them from wasting $400! That is what you should be doing talking your customer away from the $50 wax jobs!
ps-I have found clay bars and q-tips are the "money" words for explaining wax jobs vs detailing. I have many referrals that have been told by one of my existing customers that "you should your car clay barred" because that is what I did on their car and it looked great after it was done. They phone requesting clay bar/full detail jobs like their friend just had. Talking about using q-tips in the vents etc. seem to wow people as well for some reason as I always get a reaction when explain I use them when doing interiors. This again would explain the difference between a cheap car wash and a detailer.