Your JPGs won't stop anyone from taking the font, the pixels are still clear because there's so much contrast. Just reducing your image to 2 colours gets back the original:
Saving as a JPG only works when there is subtle information that can be lost, such as AA or fine, low-contrast details like what you'd get in a drawing. Don't bother with that kind of protection for your fonts. People who want to steal your work will find a way to do so, and it probably won't even be that difficult.
To make money, focus on the font's features - e.g. accented letters (of which preview only a small subset), including multiple sizes and weights of the same face (which is more challenging for a pixel font), and perhaps features like ligatures. Also, while pixel fonts often have standard spacing, some of these look like they would benefit from some kerning work, so that's something else you can include in your fonts without it being steal-able from an image.
I'm also not sure it' a good idea to sell that Star Wars font. It's not technically illegal, but typically people distribute fonts like that for free both to be on the safe side, and because that's just the non-jerk thing to do since they're so heavily based on someone else's work.
Bottom left is hard to read, but I suspect increasing the letter spacing to 2px instead of 1 would help a lot.
The big example in the middle doesn't really feel like a "pixel" font, it feels a bit rough, like a decently-hinted font being rendered at a small resolution with no AA, rather than something hand-made. Also, the long tails on Щ and Ц aren't very readable at that size, and don't quite feel like they belong because they don't have the same style of weight variation as the rest of the letters.
All in all, the fact that you're doing 10+ fonts per week shows. These fonts look nice, but some could benefit from taking some extra care to make them more cohesive and more usable, especially if you're planning to sell them.
Also, since they're pixel fonts, you may have made some clones of existing fonts unintentionally, especially in the smaller sizes. The top left and the 2nd from top on the right in particular look like things I've seen frequently elsewhere, simply because there are only so many ways you can use that space and even fewer ways to make it look good. I would avoid selling those fonts. Even though you put all the same work in, it might not go over well with customers and other font designers. However, it would be fine if they're included as additional sizes of other fonts that have the same general look.
