Midlife crisis

So when I reach my midlife crisis I would like to own a bike... and I'm not talking one you can peddle. I'd really like to have one now but Matthew said unless I can find one with a side cart to hold all the kids then I can just keep on wanting! LOL I wonder how expensive it is to fix a bike versa a car? I wonder if harley parts are just as expensive as parts for a BMW? Well I'll probably never have either one of those to compare! LOL