Company B releases a product that works pretty much as well as Company A's but is cheaper (because it isn't investing in the aftersales support). Since support is an expensive business, by cutting it Company B makes more profit.
In the long run, Company B wins. Quite a few companies are smart enough to see how this works, and so morph from being an A type company to being a B. Evolution in action, the fitter (most profitable) company survives (shame about the prey..ah, "clients").