Here are the reasons.
Sneaky Toolbar Hijacks Browsers
Nasty Malware Fouls PCs With Porn
Its really time to wake up and rid ourselves of those that utilise these kind of "Marketing" tools.
Peoples bottom lines are being effected, the opinion of our industry sinks lower.
Your traffic is being jacked and to boot the worse thing is happening. Good webmasters have earned the trust of there traffic not to fuck them over and when that trust is violated the traffic goes else where.
Toolbars are really no good. Run the gamut with how these things work and study up about them these fucking things are not going to go away till a majority of us realise truly what they are and what they do to our traffic.