Well in many cases, the product itself is not snake oil, it's just not as good as it's being sold. I work at a vendor and the product I work with has some unhappy customers who were over-sold and promised the moon when we're actually just a telescope. Being able to see the moon is great, but when it's priced like a moon landing and sold like 40 acres of prime lunar real estate, your telescope looks a little lackluster. And your boss just spent $3m on it, they don't want to hear "now we need to buy all these add-ons, plus we still need a couple more tools to shore up the defenses.

The developers (not me) are just writing the best product they can. The sales guys are trying to get sales. The pricing guys are trying to make it profitable. And no one is talking to anyone else, so the developers don't know what features sales is claiming, sales doesn't know the developers roadmap, and pricing... I don't even know who sets the price.