The Pebble Beach connection is cool but niche. Most buyers looking for a 2005 Lexus convertible won’t care about that special edition status. You’re betting that enough collectors will care to justify the premium. That’s a gamble I wouldn’t take at this price point.
I have to push back a bit on the maintenance cost concern. Yes, McLarens are expensive to maintain, but if you’re buying a $300K+ vehicle, you’re already committed to significant ongoing costs. That’s just part of supercar ownership at this level.