no it is not necesary, but some people love to step on others , and make money out of it. i know, i was married to a slave driver, all the money he made was during our marriage. used to tell me how we could be multimillionaires had he met me 20 years before. i had to live in a homeless shelter with 3 kids for 2 months because, while getting my divorce, the guy refused to pay rent on a decent place, or any place for that matter. in the meantime, we had more money in the bank than many people make in a lifetime. one time, i made us 50,000 dollars in one day. i helped make someone despicable a rich man.
other people, my dad for instance worked hard all his life to get the property he and my mother owned, he gave the shirt off his back to help anyone he could. so you see, you do not have to be a pig to have something in life, but some people just are.