, it’s tradition to put a comma after thanks or thank you . In all other cases, however, the expression (in isolation) should be followed by a period or an exclamation mark for the reason you gave.
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victokindred grammatical spiritsNow that’s a new one! (Or should that be kindred punctuational spirits?)
victoYou're undoubtedly an English major, huh?No, it’s just a hobby.