How is that not an answer? Do you think ZenDesk has anywhere near saturated their market? Why should a company that's aiming to grow take the marketing hit that comes from pissing off their current customers? Why turn potential evangelists into angry detractors?
Why would you assume that market saturation is the goal instead of the highest possible profit margin?
Not everyone thinks saturation is economically viable, or even desirable. And honestly, in a market like SaaS web apps, it would be very hard to achieve, even at rock bottom prices. A help desk tool, no matter how crappy, is not a true commodity. One will serve a given customer better than another.
Also: I wasn't asking about ZenDesk, I was asking for other examples.
In my consulting business, I raised my rates from $75 to $300 in a couple of years. I wasn't going for saturation, and I didn't grandfather at all. But that is a 1:1 relationship with clients, and I radically changed my business over that time. I also raised the price of my ebook package from $24 to $39 but that was not the same customers, being that it was a one-time sale.
I am a big believer in raising prices. I like more money from fewer customers, which means I can simultaneously work less, and have higher quality interactions with my customers. It's a win/win/win.
My SaaS is one of the most expensive in our category, and for good reason. We're growing at a nice pace, too. I want to think about how we might raise prices, if we decide to, and for future products that I am planning.
And that is why I wanted real examples. Which other people were able to provide me.
I didn't say saturation should be a goal, I said that they didn't have anything like it and therefore had room to grow. When each additional paying customer over a certain number is almost pure profit, the number of customers you have is a pretty important factor in determining how to reach the highest possible profit margin, but you know that.
Nobody in this thread ever said "don't raise prices", so I don't really understand why you're preaching the price-raising religion so hard. Fine, yes, raise prices, but grandfathering existing users might be an easy way to do so without causing a backlash that might hurt your ability to acquire new customers at the raised prices. It's certainly not such a stupid idea as to be "not really an answer", like you claim.