over the years I've met a bunch of 'vanlifers' and there is a similar theme to there answers -
"no shower, no toilet - if I add those then space is dramtically reduced or I need more power."
Shipping is another issue, yes its all well and good driving round the States and Canada or Europe, but if you want to get further afield, say South America or Asia getting your rig there is exhorbident, for one simple reason. Rigs that are over 9'6" tall so won't fit in a container and have to go either deck cargo (brave the elements) or a Ro/Ro and you better have a fat wallet.
As others have said expect between $50-100k but still pay for parking, places to stay, hook ups etc. and get stopped going to certain places for height/ width/ weight restrictions
For $7000 we have two motorcycles, travel the world, put them in hotel lobbies in South America for security (right now) when needed and pay minimal amounts for shipping from continent to continent
So yes I see vanlife as a viable option if you want to see a select part a continent, but the whole world not so much, and I had to laugh at vegasphotog comment and agree glamping/ RV sites are a total yawnfest
...and what about resale vaues when you want out???