Taxes, payroll, rent, buying all kinds of supplies, contracting and directing plumbers and the like, answering the phone, going to the bank and the post office,

Taxes, payroll, rent, buying all kinds of supplies, contracting and directing plumbers and the like, answering the phone, going to the bank and the post office, discussing invoices, daily accounting... by the way, I didn't say they are "unimportant" tasks: they are merely not profitable ones.