The parking is an extra $50 versus free parking, so if you don't want to sit and wait to leave for 30min or a little more, then the extra for parking is worth it.
You should definitely have access, and VIP parking gets you closer (kind of) but the real reason you pay for it is because they let you out faster so you don't have to wait forevvvvveeerrrrrr to get out of the parking lot. It's not a necessary purchase but helps for sure 😉
VIP parking is a separate thing, you'll be parked very close to the concert entrance. As to club access I guess I'd have to see it to be certain but it sounds like you have it (very cool). Call the Xfinity center to confirm.
Not sure about the VIP access, but VIP parking you will pay extra, but its worth it. Get out of parking area faster.
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