Actually, if I had the space for a sitdown cab, I'd pick this up in a second....even at $200. Building a seat out of wood would pretty much limit you to six minutes at a time before you felt like going to the ER to have your ass amputated. And other seats that would be appropriate are priced just as high. It's just damn hard to find something that will look like it belongs, and be comfortable, in a driving cab. This looks like it would fit the bill perfectly.
edit: Keep in mind, that there are some places where it's a good idea to sacrifice authenticity. For example, I've never understood people who build an amazing home theater and then put actual movie theater seating in it. Those seats are made to accommodate hundreds or thousands of perfect strangers who won't think twice about grinding gum or popcorn into the seat or pouring soda all over it. Same with driving cabs. Sure, they have hard plastic seats in the arcade, but not because that's a pleasant surface for a person to sit on. They do that because it's mainly going to be used by bratty kids.