my view: This has nothing to do with a lack of enthusiasm. It's a fundraising venture for the state party. They charge you $900 for participating--tagging along with the delegation at the convention--and most of that is pure profit for the party. You'll receive a guest pass each night, which means you can be in the gallery to watch the proceedings. You won't be a voting delegate and even if they run short of those, there will be plenty of alternates to step in. There's no chance they're going to let a guest actually vote on the convention floor.
If you're interested in attending the convention, it may be worth it to you. You would be able to be inside the convention hall each night and also go along to special events, hear speakers as they address the delegates over breakfast, etc.