I'm attempting to get some numbers Liam?
I don't know of any survey that includes those who didn't vote?
Any half-respectable piece of market research will try very hard to 
avoid the bias you get when you use a self-selected sample of voters.
Frankly, the data you will get by putting a questionnaire on the web and 
announcing it to people who follow XML-related mailing lists is worse 
than useless. Reaching the kind of people who wrote a couple of 
stylesheets a year or two ago, run them once a month and upgrade them 
once a year is virtually impossible, and those people are probably the 
large majority of our users.
Saxon for 12 years or so has been getting 300 (±) downloads a day, and 
we have never had the faintest idea who is doing the downloading or what 
they use the software for once they get it (if anything). Nor do we know 
how many people acquire it by routes other than a SourceForge download 
(e.g., packaged with other software). We can all speculate, but we will 
never get more than 1% of these users to tell us, and the data from 
those 1% tells us nothing about the other 99%.
Michael Kay
Saxonica
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