Small world

I thought the idea of internet dating is to meet people you DONT KNOW? How is it that out of 10 people they sent profiles of who they thought are a good match for me, I actually personally know 2 of them? And I have their contacts and phones numbers already? So should I be paying for this service when I can obtain the details myself??? I couldn't believe it when these people were recommended to me! Does this sound right to you?

Also due to the fact that I know these 2 people I know they are also not a match for me? So how can I be certain that the rest of the people on the list could be a match too?

Am I missing some logic to this whole thing?