An interesting question to ask is why do unprofitable SaaS companies get bought for very large amounts of money by other enterprise companies? The answers to that question are going to be my goals when building a B2B tool (because my ultimate goal is to make myself rich, let's be honest), not profitability (why would it be, when it's so hard to do and acquirers seem to not care).
Prove people love using your software and you can get acquired if you want.