in 2006 when I built my last truck I had almost 4k tied up into the pump. That was with 13mm P&B's , custom cut cam and a bunch of other goodies that are the norm now but where still very secret only a few years ago.
We had to buy a new p3000 for one of our 4BTA3.9's last year, brand new, straight from cummins it was only $4k canadian. It was a few years since we had to buy a p7100 for one of our 6b's but IIRC it wasnt worth much more than 5k canadian...
I would say they took you for a bit of a ride... unless they gold plated it or something