We should get more bottom end in traditional theory but it probably depends on all the other aspects of the cam profile.

Yep.  In general, that's the idea - more low end torque though sometimes it will increase torque output across the cam's usable RPM range.

Gnarly - plug a cam in to your dyno sim program straight up, then advance it 4 or 6 or 8 degrees and watch what happens.

Here's one LCE cam that has 8 degrees of advance ground in. Their website lists all the lobe position specs for their cams and there are several other grinds with varying amounts of advance ground in.

http://www.lceperformance.com/EFI-Pro-Camshaft-22RE-RET-p/1022021.htm

   Intake    Exhaust    
Valve Lash    .008    .012    
Valve Lift    .442    .442    
Advertised Duration    237°    240°    
Duration @ .050"    216°    219°    
Lobe Center    102°    119.5°    
Lobe Separation    110°       

Intake Opens    6° BTDC    
Intake Closes    30° ABDC    
Exhaust Opens    49° BBDC    
Exhaust Closes    -10° BTDC