Higher tier price is too expensive, I doubt some people will buy those more expensive tokens, IMO people will give up buying expensive prices, unless they buy the cheapest ones.
My fear is they won't know. Ie. they will send 1 bitcoin on crowdsale launch expecting to be getting in at the $2 price, only to find out 7 tranches have been bought in 1 big order and now they are paying $9.55 per EQB instead of $2.