It depends on the frame and the ideals of the manufacturer. You can make a sports car with essentially an economy motor from the same brand (Miata, MR2) or maybe a reliable engine from another (Lotus with Toyota engines), but largely it comes down to if the brand wants to spend money to do it.
If you absolutely need it, then get it used or other method to where the original manufacturer who paid for the ad doesn’t profit, duh.
Yep. Most of the time someone has marked it somehow because it’s immensely annoying. That being said, there are a few stations that aren’t able to be muted, so I intentionally make a point to note whatever is being advertised and never buy it.
Book club or maybe even some sort of 3d printing meetup? I’ve always found that the people that are interested in those probably would hit the other items on your list.