What do you think the chances are of an affiliate getting their commission if a customer visits your site, clicks thru and makes a purchase..but they have Zango or Seekmo toolbar installed?

Today I noticed both, then about an hour later I noticed a direct hit from this Agent:
Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; .NET CLR 1.1.4322; .NET CLR 2.0.50727; SeekmoToolbar 4.8.4)

Not checking out my store but going thru my images folder.

I'm getting a feeling this really sucks.

Anything to really worry about or any suggestions?