I've come across several ex-Wahhabis who converted to Shi'a Islam. One of them told me that because Wahhabis give so much attention to Shi'as, he got curious about the faith and actually started to LEARN about the faith. He was inspired with what he read and he became a Shi'a.
@NOUB: 30 Shia to Sunni conversions?
How about 11 MILLION Sunnis becoming Shi'as:
http://www.dailymotion.com/video/xb1gbl_11-millions-de-sunnites-convertis-a_webcam
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150 Salafi-Sunni families did convert to Shia Islam - Salafi/Wahabi Sheikh confessing
http://www.youtube.com/watch?v=FgPpFky0DtQ
The Salafi Sheikh must be doing Taqqiyah i guess..