Usually the three tier system is setup for one of two reasons:
First: it allows the store to upcharge entry level gear that is just a blip above essentially instructional level gear or is instructional level gear just that years line. The Middle tier helps create margin.
What they will do is label new entry level gear as mid level package and the older hand me down entry level as their base package. They take a new ski that should be $50/day and rent it for $70 then rent then year or two old that should rent for $35 at $60. Then they will have the demo package that's a $70/80 dollar a day ski and rent it for $90/100. Essentially tier One and two are the same net net and not really at a Technology level that you're going to see any sort of performance up grade from the newer year. Where as your demos may change tech every couple.
If you go to a two tier store you may pay more for the bottom but you should compare that base price to the mid tier price of the three tier shop because that's basicslly what you're getting. Where you get the benefit is they won't have the demos marked up as much on a two tier because the Middle tier isn't inflating it. Base may be $60/70 but then demos are only $70/80. So you're walking out with better gear for less.
Second: they don't want to spend the extra money on demo skis because of the cost. Thus they have a smaller demo section but don't care because their margin is highest on the mid level. So the more mid level that go out and the more they can steer people into it, the better their margin.
Essentially the mid tier is like mid grade gas. It can't run a premium engine but Itll run a regular engine but won't run it better than if you user regular.
I tend to shy away from stories that use a three tier package unless their demos are just fire (black crows, line, prodigy, etc) and the base package is NEW or 1 year old rossi exps. Then it makes sense because the mid level ski is actually a demo ski just not as boutique of a demo.
If theirs an exp or maverick etc in the mid range - that's a red flag to gtfo. Those are day 1 Learn to ski skis.
"I've lived through some terrible things in my life, some of which have actually happened."
Mark Twain