How many golden tickets do you have? Do you rely more on elevator trips or commercial floor production to build your tower?

I have about 150 golden tickets, so I end up getting way more coins from elevator rides (about 150k for a 100 floor trip). So much so that the coins I get from commercial floors are almost irrelevant to me. In this case, if I play roughly at a constant rate, it will take much longer for me to build the last floors than the first. So that's where I used to spend my bux on.

If you have few golden tickets and rely on commercial floors to build your tower, than maybe there's an advantage for you to build faster at the beginning.

Regardless, I stopped using bux for floors for a while now. I just use them for entering 8x the raffle at night.