It's crazy tbh , I've priced up jobs and got told it was too much, and also got
that's really cheap, sack it I'm gonna put my prices up soon and see what happens
Probably lose all my customers and end up unemployed 
Since being on CIU I've learned a basic rule of thumb is to gain 2/3 of your quotes.
Getting everything you quote-you're too cheap.
Getting none-you're too expensive.
Today, I quoted a house-£50-one off. Didn't get it.
Conservatory roof-£99-one off. Near snapped my arm off!
It's difficult sometimes-thinking of the money you've 'lost' but it's better that way than pricing a £50 job at £30 just to get it. IMO