The thing about the Volcano Lair/Springfield Sign deal, was that it was great ONLY if you really wanted the sign itself. Remember that the sign has one of the lowest bonus multiplier to donut cost ratios (4.5% for 170 donuts = .026% per donut spent) in the game. The aesthetics of the sign in your Springfield is awesome, but unless you really WANT the sign itself for its looks, it might not be worth it. But, hey...that ratio goes way up if you consider you're buying the Lair straight up full price at 200 donuts, and getting the sign for 50 more (Package was 250 donuts).
The Volcano Lair is awesome, but I've heard that McBain's (Wolfcastle) tasks with the Film Set (120 donuts) rival Hank Scorpio's flame thrower task. Both the lair and the sign have large footprints, so that might be another negative.
That all being said, yeah, I agree...I'd go with the Lair/Sign over this current deal. If you're spending over 200 donuts, you might as well go big or go home.
Meanwhile, I'll settle for Otto & his school bus along with Brandine, and Mindy Simmons (free!) and call it an event...