If I earn $1000 then how much will these microstock agencies make profit?

Shutterstock -
iStock -
Fotolia -
Pond5 -
Dreamstime -
123RF -
Bigstockphoto -
Canstock -
Depositphotos -
Alamy -

You can see the gross agency cut just by looking at the royalties they pay us, but profit (meaning what they earn after their costs are deducted) is something you can only see for a public company - Shutterstock is the only one right now. They have links to their financial filings on their investor pages

http://investor.shutterstock.com/phoenix.zhtml?c=251362&p=irol-irhome

It's still a complicated question - distribution deals often mean there are multiple parties involved, each taking a cut. At Alamy, you get 50% of a sale Alamy makes but if it's a distribution sale , you get 30% (the distributor gets 40%, Alamy get's 30% and you get 30%).

With Shutterstock, the answer is different for subscription sales from OD, SOD and ELs, and for several categories there are different buyer price levels even though the payouts to the contributor don't vary (ELs as one example)

Why do you want to know this? If the details matter, it's really complicated. If they don't, what's the point?

If you really want to know, pull out your calculator and figure it out using your last 1k.  Too much trouble?  Yeah, for me too.