I did a cablecar once in Switzerland...it was pretty unpleasant/scary and because of it, I didn't do a nice walk up to the summit myself. Totally agree with reason number 10 (and related ones): what's to be gained from going if there are like a zillion other people, the clouds are in, food choices are limited, it's costly and we can see the views already on YT. To my mind it seems better if we can get a nice bit of food made up then go for a motorcycle ride and if the weather is right, see similar views from the hills for free. Or just chillin' on the beach, always good!
It was actually a tough decision to make, but I think I made the right choice because of the cloudy weather issue at the time. Going all the way up there only to have a hazy view or rain would have been disappointing. There are so many other cool things to do in Da Nang too. I guess it makes for a good excuse to visit Da Nang again to experience Ba Na Hills on a nice sunny day with more money to spend haha