Yes, the kovod yidden give to our rabbonim knows no limits.
Besides, I never saw you post complaints about all the CEO’s flying — actually owning — private jets. Why is your quarrel only against rabbonim?
You’re not being asked to donate. If they decide to do this (which I highly doubt — that was an unsourced sensationalist article that likely has little bearing to the truth) it will be paid for gvirim who volunteer to cover the cost specifically for this purpose. Don’t you defend rich folks rights to purchase mansions and Lexuses? So why are you so against a rich guy buying this for his Rov?