1/ Where does most of your profit come from; Is it from buying and monetizing dropped/ expired domains?
Or do you register new domains which you think will receive type- in traffic?
Largest of "my profits" come from flipping sites and selling domains. Though lately my Parking revenue has also been picking up.
2/ Do you value domains based on their link popularity and their type-in traffic?
Or do you value domains based on their Alexa traffic rank and target market (eg. teens, tweens, girls, boys, males 18- 45, women ) ?
Traffic and Branding Value.
3/ Do you mostly buy and sell your domain names for profit OR do you buy and monetize (park, adsense for domains, develop a website) your domains for profit?
Mostly I buy and sell them.