Correct assumption.
I just feel like when I get into Vegas I'm on a vacation and I'm there to spend some of my hard earned money, this is not the time to scrimp and go with the galactically long taxi line, the inconvenient walk and wait for Uber, or the wait and share "experience" of a shuttle. The utility is the same, but for me it's the convenience and upgraded overall "ahhh" factor that makes it worth the few extra dollars.
It amazes me that people will think nothing of dropping several hundie on a good meal or a bad blackjack hand in Vegas, but they will subject themselves to a half hour wait and a cramped shuttle to "save a few bucks" getting to the resort.