Over the last couple of days I polled a few friends from other institutions (Davis, OSU, Minnesota, Tufts, and Penn). While two did say that in their instructions to interviewees they ask the candidates not to send thank you notes, all strongly agree that manners are lacking in the majority of vet students.. and all like getting little thank you notes.. it doesn't happen very often.
I guess I took issue with your remark that it wouldn't make a difference.
While it's obviously not a make or break issue, the interview is your best and last chance to make a positive impression. A little thing like a thank you note, if allowed, could only help that impression. Agreed that decisions will often be made before the card is seen but it's still a nice gesture... and not that you want to plan on reapplying... but another chance to be positively remembered in the next cycle wouldn't hurt either!
I get sore with the attitude that "A thank you email/note is nice - and if you are the type of person that would like to do that go ahead - either way it won't alter your chances of getting in."
Personally I would much rather work with the "type of person that would do that".. and if I knew they were that type of person.. if there was some way to identify that in the VMCAS it would really help narrow the field.
Thanks for letting me vent.