The emphasis of a boutique stadium is to have one that is clean. Skilled is not clean. PP wont be clean either, there is no way Carlton would hand over the keys to PP.
A clean stadium isn't about 'handing over the keys', it's about replacing the lack of access to signage and the like with a much bigger rental charge. Essentially the commercial risk is transferred from the stadium operator to the club.
A clean stadium isn't necessarily a solution to financial concerns. Your expenses will increase substantially, and you need to be able to sell the signage, corporate boxes and seats that would otherwise be for stadium members to be able to cover the rent. If you can't either sell them or get as much for them than you think, then you end up making a bigger loss. When you have to compete with 9 other clubs, doing so is easier said than done.