Still, I would rather gamble in that lottery than having a good photo selling once or twice as micro. 25c won't buy you much anyway.
A GOOD photo would sell 100's or 1000's of times as micro not once or twice.
Not if the photo is only relevant to a small group of customers. Still, it may be worth a lot to that limited group.
Microstock is very, very mainstream. The only way to get volume, is to sell what many people need.
Two examples: Cute, smiling, caucasian girl with mobile phone sells by the thousands. Child-worker from a 3rd world country will not, regardless of the quality of the photo. But again, if someone really needs that child-worker photo, it doesn't really matter if the price is $1 or $200.