I agree with all of the above.
My nephew bought a mid 80s VW for $11,000 (!!!!!!!!) which was in "good shape". He has since spent roughly another $6000 on it on parts alone (and months of his own work) so it would run properly enough to drive into South America. He is a certified mechanic, has all the know-how and tools and location to do the work, and STILL spent that much trying to get t to work.
He is currently in Guatemala - parked - trying to get a new motor shipped out because the motor (stock VW motor) he built at the beginning of the trip, just 5 months ago, does not have enough power to climb the hills in South America. He has to sit at the bottom of these hills with a tow strap in hand and beg to be pulled up each one by the truck drivers. Lucky for him, is woman is cute so they always got towed.
So, how good of an American van could you buy for $15,000? and how much traveling in 5 months? Sure, if you are a 20-something hipster (or Glen from tosimplify.com... and he rebuilt his entire van from the ground up, and new motor, and still makes constant repairs to it) you may love a VW. The rest of us... mot so much.