Where to begin. I am not a big fan of search engines period, to get placements you basically have to alter pages for the search engine, swap links with endless partners who have little or nothing to do with your business, so you end up creating content that is not optimized for your end users.
The internet is not googles, it is not yours, it is not mine, but if everyone bitches long enough, it will become the governments, and I am sure that nobody wants that.
If you take away the service because of the abusers, everyone loses.
Do you really want to pay tax on things like email, bandwidth etc.