Playing business leader is definitely not a good reason.
But after 4-5 employees it becomes cheaper to rent an office than use coworking space.
I also think that once you start hiring non founders it's tough to ask them to work out of an apartment, especially if they have an in demand skillset like software engineering.
That's just your ego. Validation, growth and profit are what makes a business really seem legit.
Many people, like me, are well aware of the cost of leasing space. I'm far more positively impressed by a company that compensates its staff well than one that rents top-end space; shows its owners are savvy or too busy to worry about trifles.
If it's a business that caters to dullards (we all have a pretty good idea of what industries employ dullard decision-makers), then that may have less benefit.