An additional 30x button would mean that each player that needs a 100x has to click one additional time going from 10x through 30x to 100x. For those that need 30 levels, it saves one click only (instead of 3 times 10, they need to click one time 30, and one time going from 10x to 30x). So, it is better to not have a 30x button.
Btw, nice and useful update.