If a skater can do a quad and land it consistently enough, I see no reason for them not to do it. I mean Ryan Bradley usually doesn't score that well even with his quads, so what good would it do him if he left the quad out? Tomas Verner's 4t is one of his more consistent jumps (ironically enough), and he has a tendency to pop or double easier jumps at the end of his programs, so it makes sense that he should always try the quad because he has a really big, nice 4t and if he lands it that serves as a buffer, allowing him to double a couple jumps at the end and not have it kill his score. I'd actually like to see Tomas go back to having two 4t and only one 3a in his FS because his 4t is better than his 3a and he often seems to pop the 2nd 3a into a 1a. The same thing goes for Joubert who is prone to mistakes, his planned quads in both the SP and FS allow him to make a couple glitches and still stay on the podium.
Jeremy and Dai it seems like last season they rarely landed their quads so for them I get leaving it out, but for the rest of the men who do the quad and actually land it most of the time (Plushenko, Joubert, Verner, Bradley, etc), I think it's a smart move.