agree too
Regarding downloads, for me SX has slightly more, but in terms of revenues it's about the double. So yes, I agree... in a sense: the 'Big 5' list bothers me (right now I experience a 'Big 2'), I would prefer to have the list of the top 10 legit and dynamic stock sites, with a reevaluation once in a while. My list would include:
SS - IS - FL - DT - SX - BS - 123rf - FP - CS - LO
my 2 cents