Sorry if I offended anyone but cars are not necessary, especially ones that cost $22,000. They might make your life a lot easier, sure, but they're not necessary.The golden Kanoka from 2004 were still quite rare.
And (bringing us back on topic) neither is this Avohkii. $29,000 is insane for a collector's item, especially one (as I've mentioned earlier) that you can't even do anything with for fear of spoiling it!
Incidentally, was this the last super-rare/super-valuable Bionicle collectible to be released?