Sorry it is difficult to trust almost anyone in the trades. It is easier to do the work myself and not deal with strangers in and around my house. When I have to hire someone I tell them up front that I'll be checking every detail, pay extra to purchase the materials myself, and if they don't want the job - well good! I always fine someone who will work with me as I pay a bonus for that.
I was taught to paint by a professional and when estimating the amount of paint needed, I always allow for a second coat just to make sure of coverage. We interviewed a painter who tried to tell me I bought poor quality paint without knowing where I purchased it, and stated he would have to buy all new paint. He had not seen the cans and was just guessing so I asked him where I should buy paint from now on. It was the same place I had purchased my paint and he wanted to charge me an extra 20 a gallon more than what I paid for. Needless to say, I have interviewed numerous painters and they are not all honest.
According to the Bureau of Labor Statistics, 45 percent of all painters are self-employed, though that number may be slightly higher if companies hire freelancers or self-employed painters as part of their team. The price that painters charge for their services is largely dependent on their association and whether the job is completed in the warmer or colder months (painters often charge more in the summer and less in the winter, given demand and other factors). More information regarding painter rates and associated factors is included below.
Here is where this affects you as a consumer. You select a painter with a contract that says 2 coats, $500 down. You give the company the deposit and pick your colors a couple of days before the project starts. The painter goes to the store with your colors and figures out they are deep base. He (or she) not only needs to charge you more for the paint, but he also needs to charge you for a dark gray primer coat. Ninety nine percent of the time that primer coat is going to be really, really expensive since you already gave a deposit.
IF the average cost is $1700 to paint an interior, then that means the cost of paint is approx. $200 (12% of the job). Or better said 5 gallons of paint (if the average cost is $40 retail). The average room takes 1.5 gallons which will cover 3 average rooms. Doesn't sound to average to anyone with knowledge of this industry or a average house. You are misleading consumers and should do a better job in your research. No wonder so pay people think prices to get work done by professionals is high. Its not high, its actually average which is more like $3700.