I sort of get the why they moved. We left a few years ago after decades living there. We were children when we moved there. Met each other, had our kids, bought a house in the far NW part of town (saw Sister Wives very often out and about), friends and family, etc. there. DH was getting tired of the work demands, being denied work promotions, the weather, the huge uptick of home burglaries. I was getting tired of the schools, traffic, no work/life balance, & Vegas has indeed changed. We lived there before the population hit 1 million, Green Valley Ranch, Summerlin, & the 215 fwy didn't exist. It use to take 25 minutes to go from 95/Horse (now Skye Canyon) to Sunset, now it's a 45-90 minutes one way or you leave extra early or extra late to dodge the traffic.
A promotion in another State that is expensive compared to NV for DH came up and we said what the heck. Let's go for it. He got it. Then he got another promotion where we relocated again within our new home State and we're in love. Scared as heck leaving everything we knew before all this went down. Questioned how are our teens going to handle leaving all that they know behind. Yet now that it is all said and done, it's one of the best decisions we've ever made. We've done more living out of State then we ever did living in Vegas. Plus living away from Vegas gives us a reason to vacation there.
So I'm thinking for them, it's work (the show) and Vegas has changed.