Not sure, but it's always better to get them when at a discount. This is my first and immediate response but when I dig deeper the answer changes.
It's interesting that you asked that, as I was just watching a documentary on our consumerism and culture of excess. There are different parts to me and they would give you differing answers, however, the simple all-encompassing response is probably 'No, I don't need new sticks'.
I currently have the TC95 and TC97 in both string patterns (and some spares just in case). I tried the K7 Red and didn't gel with it (preferred the TCs), and for that reason won't be giving the K7 Lime a go. I'm not interested in the larger head sizes of the TCs, which doesn't leave much else.
Sorry for the longwinded answer... I'm just trying to figure things out and thinking out loud