By that I mean, clients with budgets will opt for enterprise services. That's not necessarily fair, but humans like expensive stuff, especially when it's not their money.
The thing is, engineers who move into SaaS and try to tackle that middle ground tend to be shafted. This is why people like 'patio11 so often recommend aiming for the enterprisey folks - that's where you make a living.
At a high price, you can get strong service guarantees.
At a zero price, you can use open source and manage the critical service yourself.
At a low but nonzero price, you get neither.