Some interesting FACTS re Alamy:
I made a few dollars (less than $50) for a while, but I think to get the big dollars you have to be very proactive and uploading new stuff all the time. I know someone who has over 15,000 photos on Alamy and they don't make a living from it ($600.00 last financial year). It was hard work to get photos approved, and from what I know Getty are stricter than Alamy. Yes stock photography can work, but there are only a select few that make a living out of it, and don't need other income. In 2009 one person made over $200,000 from Alamy, 3 people made over $100,000. There are over 30 million images on Alamy.
Now to put it all in perspective, in 2009 Alamy paid out $8Million to photographers. Remember there are 30 million + images on the site. There are a lot of photographers not making much, given these stats. Yes you could be one of the select few that make over $100K, but are you willing to put in all the work needed, to do so?