make class specific guilds so you can invest in them to raise the cstomers levels

[fiery osprey]

like say every 2 levels or so the fighters would want a higher grade of stuff so's you dont get stuck with 50 million people wanting lvl 1 stuff when you can make higher stuff

[sterile osprey]

But who's gonna buy my low tier stuff?

Jokes aside, I don't think customer levels are worth the pockets of gold that the building would cost to invest in.