I think they deal with that many people with no idea they actually believe everyone is like that and consequently think they can rip you off. I have a close friend who did a unit development, he got his contract from the project builder, hidden in it was $3500 for new sewerage cut in. He rang the water authority, they told him "nah mate there is already a t junction there, they just need to connect in and notify us" - one $15 pipe joiner charged out at $3500!! Did the project builder learn their lesson, no way about three months later he gets a call saying, "mate we have been held up by brick supply, this is out of our control so we are invoking our right to increase the price based on time constrains beyond our control, we will send you out an amended contract to sign. Stupid project builders did not realise that the client is actually a comercial representative for the said brick supplier who was apparently holding them up. A quick call to one of his coworkers tells him there is no hold up, the builders put a hold on delivery because they were not ready for the bricks. So he screws the project builder to the wall and has them build a heap of extra retaining walls for him at no cost - they could see their current brick price going up real quickly as the brick supplier was not happy that they had been used as a .
Moral of the story, believe very little any project builder says and question everything, make them earn their dollars. When it comes to contractors, I go by a simple rule, don't employ anyone who you would not invite over for a BBQ and it not happy to have you work with them. If they won't let me help them I put them in the dodgy category. I can't see how our supplier is making any money out of us because this is what I have done, to the point that they offered me a job as a site supervisor:rolleyes: My contractors, all fantastic and we will be having a big BBQ at the end:)