If you are a lonely guy with about $17,000 in extra cash and like to ski/wakeboard, while I am sure there are more, here are two options. You could buy a used boat for $15,000 and rent some friends and gear with the remaining $2,000. Or, you could buy this Skier/Wakeboarder Controlled Tow Boat for the full $17,000.
The pictures don't do it justice. This Skier Controlled Tow Boat is almost 8-feet long, goes up to 40 MPH, has a three-cylinder 2-stroke 70 horsepower engine, a tri-hull fiberglass construction, and a 40-foot tow rope with controls (pictured below). The remote controlled grip allows the rider to start/stop, turn, and speed up/down. If you let go of the rope the boat will stop. Video of the SOLO Ski in action after the break.