We charge about 10x for enterprise customers. The only difference between what they get and what a normal customer get is that we deploy the enterprise customers on their own servers/network.

Considering how long end exhausting the sales process are with enterprise customers I think the price is fair, even though the extra cost to operate that kind of customer is negligible.

I'd add that the minimum bill is $10000 for anything enterprise. That's a bare minimum to handle all the time and extra work they will incur (months of sales process, dedicated AWS instances, heavy support burden, single sign on integrations, etc...).

As soon as you hear any of these, it's the hint you're dealing with enterprise and you have to up the price tenfold.