The reason people want to get ahead is the alternative is being left behind.
Please review Soviet history and see what happened. Also study the life of Alexandra Kollontai.
When the Bolsheviki came into power in 1917 they regarded the family, like every other 'bourgeois' institution, with fierce hatred, and set out with a will to destroy it. 'To clear the family out of the accumulated dust of the ages we had to give it a good shakeup, and we did,' declared Madame Smidovich, a leading Communist and active participant in the recent discussion. So one of the first decrees of the Soviet Government abolished the term 'illegitimate children.' This was done simply by equalizing the legal status of all children, whether born in wedlock or out of it, and now the Soviet Government boasts that Russia is the only country where there are no illegitimate children. The father of a child is forced to contribute to its support, usually paying the mother a third of his salary in the event of a separation, provided she has no other means of livelihood.
The peasant villages have perhaps suffered most from this revolution in sex relations. An epidemic of marriages and divorces broke out in the country districts. Peasants with a respectable married life of forty years and more behind them suddenly decided to leave their wives and remarry. Peasant boys looked upon marriage as an exciting game and changed wives with the change of seasons. It was not an unusual occurrence for a boy of twenty to have had three or four wives, or for a girl of the same age to have had three or four abortions.
References
- https://en.wikipedia.org/wiki/Alexandra_Kollontai
- https://en.wikipedia.org/wiki/Komsomol
- http://uhra.herts.ac.uk/bitstream/handle/2299/11626/Chapter_7_corpus_delecti_author_postprint.pdf?sequence=2
- https://www.theatlantic.com/magazine/archive/1926/07/the-russian-effort-to-abolish-marriage/306295/
- https://www.marxists.org/archive/kollonta/1920/communism-family.htm
I fail to see any connection between marriage and sex and the horting of unused money/physical goods.