There are two important reasons for creating and launching cubesats:
1) Learning opportunity - that's how people get experience with space technologies.
2) Equipment testbeds - companies that would like to sell technology for use in space need to prove it actually works in space. If you can get a CubeSat project to use your component (by e.g. donating it + some money) as a part of their satellite, you can test it in space for much cheaper than it would take to build an entire satellite on your own. It meshes nicely with 1), as people who want to learn space technologies tend to not have money to build and launch satellites on their own.
As for your original question: we're far from the point of having all necessary sensors in orbit. There's not much to rent out yet.
That’s like saying you need to access certain sectors of a hard disk.