Actually I think the guy at our shop is looking for you to go up in weight so the Vapor 5000's might be necessary later. I don't have a chart in front of me. If these are spined for 80# and that's what you are striving to achieve (I don't know why) he could be saving you money in the long run.

How long you intend to shoot at 70# can be a factor, too. You are surely going to lose some arrows, break them, or just plain destroy some and will need to replace them at some time. You could get 4000's for now and jump up a spine later when you tuen the bow up. This is for you to determine.

One other thing. Blackhawk Vapors are not the most expensive arrows on the shelf. Maximas are pretty near the top of the price range. So "NO", I don't think he's trying to rip you.