Is it worth investing in a better bike?

If something helps motivate us to do a workout, physical activity. If such an investment translates into our healthier, stronger body. If the purchase does not keep us awake at night and does not lead to financial problems. If the purchase is not another toy in a month or a year, in a moment littering the world.
This.. however, is still an individual matter for every thinking person.
But you should take care of your body anyway.