The rent for robco is $50,000, which is fairly high because of its popularity.
How it works
In order to operate the machines inside robco you must own/co-own robco (your name on the door(s)). Once you have been added to the door you can start to run robco! First you press USE (default "E") on the button beside the oil spawner, then carry it to the oil holding chambers. Once you have all 4 chambers loaded you can press USE on the control panel, and you're done! Just pick up your item from the other room.