Considering the supply vs global population = 0.003BTC per person to go around.
Then other factors like not all 21 million will be in circulation due to lost wallets/deceased hodlers who never informed anyone where their seed is, and also an increasing global population and future generations who all want in.
Do you think 0.1BTC will be like owning a mansion?
Definitely it's like owning a valuable property nowadays, and that 0.1 btc during those day of 2017 was not a big deal compared today. But for now, it's really an amazing profitable amount to generate bigger gains once it earns passive income specially when you're proficient with day trading and other crypto investments.