Selfishness is normal—it shows ambition. It’s just because you haven’t eaten your fill yet.
Selfishness isn't a problem; greed isn't a sin.
To those in power, the fact that you consume isn't an issue—because in their eyes, you're nothing more than a tool.
Consider a farmer raising an ox: if the ox has a big appetite and eats well, with glossy fur, how does the farmer feel? Only happy—because what the ox consumes still belongs to the farmer in his eyes.
But when you take, that becomes a problem. What he truly cares about is that you're taking outward—taking away from him. That means it's no longer his, and he starts suffering a loss.
As for your regular salary, that's meant for your daily expenses and rent. The company's calculation always assumes the money it pays you is yours to spend—if you spend it freely, you'll feel physically and mentally satisfied, which improves your work efficiency. The company never intended for you to save, let alone start a business, launch a company, or become a competitor.
If you take the budget originally meant for renting and use it to buy a house—and then complain it's not enough—you want a bigger one. What does that benefit the company? Nothing.
It only distracts you, pulling your focus away from work, making you spend each day wondering whether your wealth has appreciated, whether you can retire early. If you want a bigger house, the company offers you another path: work hard to become a partner, earn stock options, and cash out after going public—rather than expecting to build your initial wealth solely through your salary.