To the extent you intend the Tiers to rank in order of importance, there's a good argument to be made that Tier 4s have a much higher value than Tier 3 and often make sense to pursue--Calvin Anderson, Parker Braun, and Tre Watson are all good examples of "Tier 4" guys that make good sense for most programs in the Country that don't have established starters or known quantities.
The fact that they're basically irrelevant for purposes of counting scholarships dramatically increases their value. I.e., if you "miss" on them (like we did that GT tight end from Syracuse), it's meaningless, and if you "hit" on them (like we did Calvin Anderson), it's found money.