Buying in bulk, I can guarantee you, you won't get it cheaper/better.
I see your point, and I know where you are coming from.
What you don't see is.... studio will NOT want to pay for the equipment unless necessary, they want to collect money, pay out minimal to pgs. Not to convenient them, let them earn money.
If you noticed, few posts back I shared how it works, collect $700 from couple, pay out $250 to pg.
Why would somebody want to pay for the equipment and share/hire pgs to use their equipment? Likely the equipment will be used until it breaks totally.
The studio won't want such liability, thus they outsource to pg who own their own equipment. Economies of scale & NO responsibility is something everybody wants.
Not all studios are orthodox, and if a couple comes to you with $700, $500 for your taking, and you really would CARE about hiring a pg that knows how to use your equipment?? They'll just tell the pg, take whatever you need from the box... maybe inside left only Sony, and he only knows how to use Nikon.
You think the studio will CARE about that?
You're wrong my friend...