I'd pay 10 bucks easily, 20 bucks somewhat uneasily, for some additional features, yes. I would never pay 100 bucks under any circumstances. For demographic purposes, I'm a working adult.
One of the features I most want is a way to import background images, especially into Bitsy Color. I started making a game ages ago and lost all the game files, but I kept screenshots. I would love to be able to just insert the game art by using the screenshots, instead of manually going in and re-making all the sprites and background art by hand. Someone did at one point make a tool for this but it didn't work for me.
I definitely do not want Bitsy to be overloaded. I want Bitsy to be something a 1st grader can learn to make a game with in just a day or two. And I love how we are all equalized with Bitsy - there is no real way to make a mind-blowingly amazing game, which reduces stress levels when messing around with it, because there is no genius level to compare yourself to.