This is so important. One of the things that kills company culture before the company even takes off is getting a sense from the founders that they're just trying to fool desperate/clueless people into working for them for less than what they're worth.
The startups that actually succeed have the philosophy "find the best people and pay them a lot". All the successful unicorns and decacorns over the last 15 years have a reputation of paying people well. There is literally not one startup I can think of that succeeded but has a reputation of underpaying.
And if you're unable to pay employees well then you're simply not well-capitalized enough and should drop the project.