How many basic reasons to work are there?

To make money. And making money means you can buy food, pay bills. But when you do make money don't play around with it! Spend it on what you need first then you can play with it.

"One can work for as many basic companies as they want, so long it is not against a contract they have agreed upon. You are allowed to work however many jobs you wish."

There is no atmosphere. Without oxygen matches will not burn. The atmosphere also causes space debris to burn up before it reaches earth.

so they can pay their light bills gas bill n other thing

Currently there are 353 known extrasolar planets (that is to say, outside of our solar system), but it is unknown how many planets exist in the universe.