MicrostockGroup

That last bit in the article about 42 sales is a bit silly.  If he were selling that image on microstock, he'd likely get something like 4200 sales over the same period of time, giving him at least as much royalty income.  Nor is there a mention of the vast number of stock images that never sell.

All of the old books I've read that mentioned stock photography mentions you get very few sales per image (average was about once per century) at a high cost, averaging $0.50 to $1.00 per image per year.  Not corrected for inflation, microstock typically does better than that for me.