This pretty much holds true with all the minor ones, although some of the shadier outfits like Xuppa probably send fraudulent clicks to any possible term you could think of.
Originally posted by Professor
Findwhat is and always has been spotty. The key to success with them is WHEN you advertise and which terms. The popular terms can be really hit hard with questionable clicks. The lest trafficed and therefore less abused terms can produce some actual results.