You may be fine with $1000 a month. You have everything you need: food, bed, apartment, electricity, etc.
Now you get a new job and have $2000. You try out more expensive food options and realize you like them better. You move into a bigger apartment and start enjoying the freedom.
You may never wanted this if you didn’t try it, but now that you have, you don’t want to go back. You may not have noticed that your mental and physical health was degraded due to your previous living conditions until you get better after raising your standards.