Due and Marco,
Great posts both of you. Glad some educated folks who did their research finally decided to make some posts here. (That includes you too Dave Knell!

)
Nothing pisses me off more than some webmaster calling a dialer malicious when they have no fucking clue what they're talking about.
Marco is correct. Dialers are heavily regulated by both U.S. and U.K regulations.
Visa/Mastercard lets you process for beast, scat, etc? You can forget processing that stuff with a dialer. We never could and never will be able to process that kinda stuff.