Flicker by the numbers:

Unique Visits:
 3.6MM /yr

Source:
Direct Navigation (95.74%)

Outbound Clicks:
400K /yr

CPC Keyword Values:
(Photography equipment)
$2.50 -$3.00 /click

Daily Value to Advertisers:
$2700.00 - $3300.00

(Data is approximate, tracking by Google Analytics)