"Thank you for your interest", twice: Tacky?

[PaperTowels]

As a matter of personal preference, I try to thank schools that interview me for their interest, as I consider it polite.

 

However, during a recent exchange I've thanked an administrative person in this way, and the exchange was forwarded to the faculty member who will interview me. So now if I thank him too, do I seem like I'm kowtowing excessively? If I don't, will it be strange that I'm thanking the staff and not the actual professor who wants to interview me?

 

Sorry if this is trivial, but it's hard not to worry about every single thing with something important.

[CBrown]

As long as you don't copy and paste the exact same greeting or email I don't see why it'd be considered strange, good luck!