It's A LOT harder to own an ATV/Dirtbike than just having the money to buy the actual bike... Do you have any idea how expensive they are to up-keep? They require premium gas and oil is expensive. Not to mention buying all the riding gear ($1,000), transporting them ($1,000+ for a trailer), and registering them. Gas to drive to riding spots... It adds up.
I have two YZ250's and DAMN they are expensive. I always wanted one growing up and didn't get to until I could afford it when I was 20 and if it weren't for my bf splitting the costs I still wouldn't be able to.