There are people who make good money pumping out a ten-page story a week. And by good money,I mean like 30K/year.
There's a bit of a business model to the trick:
Make stories $1.99
Make 5 of them related
Sell the 5-story anthology for $3.99 or 4.99
Wash, rinse, repeat.
That way, you can often get paid twice: Once when they get your short, and again when they like it and get the anthology--which they're more likely to do than buy 5 individual stories (even if they like them).