Your poll doesnt include all options.
For instance this site is not on vb4, but not for any of the reasons listed.
Your screenshot is somewhat meaningless, one random screenshot proves nothing really, but if you really want to examine it, more people are in the vb4 programming discussions and the vb4 design discussions than their vb3 counterparts.
Heres another one for you

My vb4 install count has now overtaken any of my vb3 versions. It continues to rise at a steady rate. So vb4 must be more popular than vb3 now .. right ?