Not necessarily. Some buyers want domains with PR, some with age, some want trust, citation flow and a great back link profile. Some want keyword rich domains, some want short domains, others want keyword rich domains, some want highly brandable names and some want it all.

Depends what a person wants to do with them.

Alot of the most profitable domains have been picked up unfortunately

Domains with buyer keywords can be easily sold and also catchy brandable domain names.

Do NOT go on a domain buying spree without knowing what you are doing. I can guarantee you will buy losers.

Stop, breathe, do at least 10 hours of research here and at other forums (dnforum, namepros) and then think about what your domaining strategy should be.

10 hours is not close to enough, but at least it should give you an opportunity to see all the crap people have bought that they are unable to unload at a loss. People who thought they had great ideas about what would be viable in the marketplace. They are almost always wrong.

Understanding how to locate and acquire winners is a whole other research project.