I too have a few graded coins (I never sent them off to get graded, I purchased them already slabbed). I originally started collecting coins when I was young, but converted to stacking later in life so I have an appreciation for the numismatic value of coins as well as their PM content.

Basically, I like to have a little of everything in my stack. I enjoy looking at the coins for their aesthetic value as well as their precious metal content.