What does this suppose to prove? The OP said "very few" not none. Of course there will be a few anecdotes of overlap.

A better way would be to compare the size of Stack Exchange boards at https://stackexchange.com/sites . It's not perfect but it's as good as it can get. Stack Overflow has 26 million users. Woodworking has 17 thousand. A fraction.

Further still, not every woodworker will use a belt sander. It's used for a specific purpose (large flat surfaces) and it's not a beginner's tool. So the fraction gets smaller. I'd say the assumption stands.