I have to agree with the OP here... Everything in life comes with a set of instructions, IPB should be no different.
If you educate people properly about your product then you should reduce some of the strain on your support system, you will also reduce the amount of frustrated customers who post there questions here and never get a reply. If you put the hard work in at the start, it will pay off in the future giving you more resources to build more products to make more money... see where i'm going here?
To use the excuse "we have more developer documentation at this time than anything else." is just lame IMO. It goes to show that you didn't do the job properly first time round.