Lots of folks don’t go to marble shows and their access to marbles for sale is somewhat limited to the internet and some antique stores or flea markets.
It’s a case of “supply and demand.” It appears there is more demand for a limited supply and that bodes well for marble collecting. You just have to learn to be a smart buyer.
No. Much too yellow. Snotty is more light greenish beige. Someone can probably provide a picture (not where my marbles are right now to take one). Looks like real snot, hence the name.