Most test-takers neither want nor need to become GMAT experts themselves, but you would think that they would at least want to buy a book written by a real GMAT expert (here's a $5 example), and not some poor Kaplan worker bees working off a 20 year-old book template full of unrealistic GMAT practice questions, redundant chapters and glaring gaps in information about the exam.
But hey, that's just me.
I think the real problem is that we often equate the number of years in business with quality. Yes, Kaplan is the oldest (and biggest) test-prep company, and perhaps the most profitable as well, but as most of us in the industry already know, it has become a bloated, profit-first, quality-last corporation that is now very, very far from the best.