I got as far as entering the colors into the box and adding together their values and pressed ok and it still won't let me in. There's no way I'm doing this wrong...
I agree with many of the other comments on here. Regulars at a certain level should be able to say "the usual" and have their order tag automatically come up. Once you get to a certain level, you should be able to hire someone to do SOMETHING for you. And it does get a bit mundane; perhaps upgrades could include other foods instead of just posters and crap.