I'm reminded of the guy who spent the last 10 years complaining daily about everything that he hates about his car. Then it's time to trade it in and he tells the dealer it is the greatest thing since sliced bread and it's worth double any price the dealer is willing to give him. If a person wants to convince you RVing is the cost effective way to live or travel they are going to leave out anything that doesn't advance their argument. Things like repairs and depreciation are conveniently left out of their equations.
To me, RVing is a nice middle ground for vacationing. Sure, there are many ways to travel cheaper, just like there are many ways to travel more expensively. Thankfully, for me and many others how I vacation is a choice made out personal preferences, not financial necessity.