Yes that can all be possible.It`s possible that they are mining for them selves, even when i visit it will not proof they are mining for me, or who knows. Bit of trust will not hurt you.

See it like this, I have daily payouts and i made roi, what more can i ask for?

To answer your mining question, i do not see CGMiner, i see payouts, i can choice coins, no pool choice.
Wait, this makes it more clear: https://www.youtube.com/watch?v=a57NhdyQ6tw