By your definition, Feudal England was "collective ownership". A handful of executives having ownership of a company != collective ownership, that's closer to an Oligarchy than anything.
Hospitals want to grow and want to stay solvent (regardless if they're for or non-profit). $400 Ibuprofen it is!
Price transparency is one solution for this.
"Hey, we noticed you pay your executives $25 million a year. We decided to cut the executive pay allowance this year."
"Hey, we noticed you're paying your shareholders 50% of your revenue. You seem pretty profitable, so we're cutting your reimbursement rates for all procedures this year."
Such a system is eminently practical. What's not practical is the current US system.