Getting regular payouts

The fun thing about doing microstock as a hobby, is that you earnings increase as you put out more pictures for sale. I'm starting to hope that I might be getting payouts every month this year.

My payouts stats:
February 2010: $242 (Dreamstime)
October 2010: 105.95 (Shutterstock) + $101.68 (Dreamstime)
January 2011: $117 (Istock)
February 2011: $106.53 (Shutterstock)

My current balance, and estimates for the next payout:
Dreamstime: $83.47. Estimated payouts March and August 2011 (average income per month: 20. Payout limit 100)
Shutterstock: $2.62. Estimated payouts June and November 2011 (average income per month: 20. Payout limit 100)
YayMicro: 20 Euro. Estimated payout June 2011 (average income per month: 2. Payout limit 30)
Fotolia: 13.9 Euro. Estimated payout August 2011 (average income per month: 5-10. Payout limit 50)

Veer: $64.05. Estimated payout 2012 (average income per month: 3. Payout limit 100)
Scanstockphoto: 21 Euro. Estimated payout 2012 (average income per month: 2-3. Payout limit 50)
Istock: $5.45. Estimated payout 2012 (average income per month: 5. Payout limit 100)

Bigstockphoto: $15.50. Estimated payout 2013 (average income per month: 1-2. Payout limit 50)
123RF: $17.51. Estimated payout 2013 (average income per month: 1-2. Payout limit 50)
Can Stock Photo : 12.35. Estimated payout 2015 (average income per month: 1. Payout limit 50)
Depositphotos: $11.38. Estimated payout 2020 (average income per month: 0-1. Payout limit 50)

If I upload a few more picture, I'm sure I can manage to get a payout from Shutterstock in April/May instead of June. The same goes for YayMicro. Scanstock and Veer are wild cards in this game. I got a surge in sales there in January. If that trend continues, I might get more payouts this spring.
Depositphotos started ok last summer, but has completely died this winter. They will probably die soon.