NOTE: This is an excerpt I wrote about a month ago at the House of Paincakes
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I feel that that it applies here as well.
"How often and how much should a customer have to pay for rules to play a given faction, and how often can a rules product be superseded?"
Let's start here - A company can decide whenever they want to release a new rule set or army book. A customer has two options in response 1) buy the new book and 2) Not buy the new book.
Each choice (both company and customer) has it's own set of positives and negatives. Assuming that new book is a retooling of everything to be less broken/stupid/error/etc and is only released when it is truly needed I can be understanding of buying a new book about every 5 years - sooner if it is needed. Usually when it is done this way customers are more than willing to accept the differences, and spend their money (as long as the price isn't crazy) which appears to be about, $50 or less for a book.
However, if the company decides to simply release a new book for the sake of releasing a new book...bad things can happen. D&D fell apart long ago, even Pathfinder hasn't been able to fix all of the problems, and now the player base is divided and cannot really FORCE change upon the company. GW went through this a little bit as well when (40k) 7th edition was released. A lot of people saw it as what it was, or perceived as such, a money grab. THIS is bad if what you have, or what you want, is a united player base (as such GW has this); because this causes friction, often unnecessary, among the players and rifts can appear. Some players leave the game, some revert back to a previous version of the game, and others continue along at the company's pace. No matter the outcome, the company effectively loses - lost customers, no more income, and less customers & less money being spent being the results.