me, when I started I felt the same way, take anything that I want to. But later, when I started getting some aspirations about releasing music and became aware of all the intellectual property litigation stuff going on, I started to have some concern to avoid expensive and time consuming sample clearance and/or prosecution scenarios.
I still do sample copy protected stuff for some projects, but I often keep that distinct from stuff I do with no copy right violating samples. For instance, my Blake Brillo persona uses no copy protected samples, but DJ Plan A will flip anything he feels like. hahah
www.myspace.com/blakebrillowww.myspace.com/planahiphop