I don't know much about SEO, but I don't think that receiving the number one spot for 'claudia-marie' is any kind of accomplishment when your DOMAIN is
www.claudia-marie.com - I would freak the fuck out if the exact search term of any of my .com domains were not the first result in google
I still don't think you seem to realize that you're congratulating someone for stealing direct sales, yes stealing
The purpose of having affiliates that receive 50% commissions is that they're likely to bring sales to your website that you would otherwise not get if you did not have affiliates, amirite?
How does someone taking over your number one spot in google and sending FuCKLoAdS of salez!!! have anything to do with that? It's a search engine, not a banner/advertisement
If this affiliate had SEO'd to get the number one spot for "milf big tits" or something like that, and was sending all of that traffic to claudia-marie, that would be something worth congratulating him for