You do realize that this was started by the old regime, probably 50 years ago, going to California for training camp,
I mean I don't know when it was started but don't blame Jerry because he kept the tradition going, they usually are doing it for the weather instead of practicing in 104 degrees right now with the humidity up around 80%.. I'm an HVAC contractor and I got to tell you that I just came from a job this morning where is supposed to be the coolest and I was standing in someone's garage with the garage door open where their AC unit was the indoor section for about an hour hooking up some stuff my entire shirt was soaking wet, my shorts were half wet ,and my socks we're wet it is brutal right now to even stand out in this stuff let alone not understand what these dudes would do practicing outside and end up dehydrated cramping and end up injured because of it...
they get the players together in hotel rooms or wherever in the dorms ,they can get camaraderie built away from their family less distractions and also you get the West Coast fans which there are quite a bit of them a chance to at least mingle with the team to me that's a win win
oh and if you ever ran a business you'd know making these trips or business trips they're all tax expense deductions and whatnot ain't nobody worried about some expenses to have training camp in Oxnard CA...