Sadly, Lookout, the life JB led, entirely belies all you believe it to have been. Had he gone straight from school to farm and never left, I'd have agreed 100%. Under such circumstances, he wouldn't have been able to function without Nevill's direction. As it was, he was unable to function without Nevill's financial back-up, something he was assured of, and took maximum advantage of, wherever, in the world he travelled. He travelled to put as much space as possible, for as long a time as possible, between him and a future he'd become partially resigned to if he wanted to hit the jack-pot, and had managed, more than adequately.
He didn't " hit any jackpot" Jane

Far from it ,as that was well squirreled away and pre-organised before he had time to think.
In-laws of mine were business people and I knew how they ticked when pa-in-law died. Yes, there was much sorrow, but it was soon overtaken by " who'd get what " which I remember at the time being sickened by.
Different circumstances to the Bamber's of course, but the same lack of sentiments that JB's extended family showed. Money/ properties soon took over and rows etc within the family ensued. However that was in the 60's, but it seems that some things don't change.
JB travelled because he was financially able to do so with the help of his parents and why not ? Something else that I saw no relevancy to in this case. JB was in well-paid employment too so that was no big deal either. Like many, he'd wanted to see the world and he had the opportunity to go. It was no crime but must have, or did, get up the nose's of the extended family as the private schooling had done too. Why ? It wasn't their money that was being spent.
I believe JB did farmwork in Oz/ NZ for his accommodation and keep----no posh hotels or motels. Travel broadens the mind and outlook on life and it would have been a treat to break away from the stifled, regimented way of home-life----nothing wrong with that for one so young at the time. I bet his parents encouraged it if the truth be known, I know I would.
There are certain aspects of this case where jealousy raised its ugly head and I've read a lot of it !