If it's only about transactional business relationships, that's a high percentage of one's energetic waking hours to be spending on it.
I think it's justifiable for employees to feel some amount of loyalty to the concept of the startup when they join it, since they are inevitably taking a significant amount of risk when joining an early-stage company (growth stage startups will be fine).
What I don't get is how not many founders believe that loyalty is a two-way street - you should expect to be as loyal to your employees as you expect them to be to your startup.
You should trust that your counterparty will abide by the written terms of the contract. Believing anything further is folly.
It's just business.