"survey spamming"
In medical trials subjects are very often paid. I would guess that the response rate for a Wikipedia survey would increase if the researcher mentioned that the subjects/survey taker would be paid.
In a survey for our "Lyngby" programming toolbox we made a lottery among the respondents and gave away a gift card for the Amazon online bookstore to the winner. Among the 270 registered users we got 28 responses and one regarding our survey as spam.
/Finn
___________________________________________________________________
Finn Aarup Nielsen, DTU Informatics, Denmark Lundbeck Foundation Center for Integrated Molecular Brain Imaging http://www.imm.dtu.dk/~fn/ http://nru.dk/staff/fnielsen/ ___________________________________________________________________