each tier should be more explicit and bounded.
t1, asteroid, ore. maybe plates.
T2. plates, circuits, fruit, solid fuel, ammo, turrets, belts, inserters. early game components and machines and stuff.
T3. adv circuits, proc units, lds, modules, equipment, refineries, Chem plant, tank, etc. advanced midgame type stuff.
T4. endgame, planet specific. foundry, nuclear reactor, biofactory, T4 belts, stack inserters, rocket turrets, railguns, t3 modules, nuclear bomb.
more importantly. each tier disables the previous tier. at t2, nobody will request your asteroids. maybe they will buy ore, but probably just plates and circuits and crap.
Also, rep should specifically add more buy/sell slots, increase capacity(especially for high end machines and science packs) and maybe let you force a restock at rep cost.
multirequests. mostly for military purposes. they want to outfit an assault force, so buy 100 heavy armor, 100 stacks of red ammo, 100 smgs, and 100 stacks of grenades.
might also add in, asks for higher quality stuff, but I dunno if you want to go there.
The market at least should be willing to buy higher quality as a minor markup, and sell for a major one (and reduced quantity)
