I spend a lot of time online looking at teaching ideas on pinterest, products on TpT, and reading other teaching blogs. I'll be the first to admit this.
However, I'm a little bit bothered when I see materials/activities geared toward multiple grades. I understand the K-1, K-2, 2-3, 4-5, 3-5, etc bands. Heck, the text exemplars in the Common Core are in grade level bands (which is why we always check with fourth grade about the texts they're using).
But I am bothered when materials are being promoted as K-8. I certainly hope educators aren't using the same strategies and learning activities with kinders as they are with eighth graders. So please, fellow educators, market your products to the appropriate grade(s). I'm going to be very wary if your idea is self-proclaimed as appropriate for both five and fifteen year-olds.