Would it be a satisfactory quantity if I had 0.1?
Hodling 0.1 Bitcoin is satisfactory if that's what you can afford without breaking your bank, you don't have to follow the crowd and Invest outrageously as they're doing because that's a wrong way to go about investing irrespective of what you're Investing into. Bitcoin is the future and it'll be great if we can accumulate as many as we can get our hands on but you shouldn't invest more than you'll be willing to hodl when the market is experiencing a correction as when you invest more than you'll be comfortable losing, you won't be at peace with yourself when the market is declining and that can influence your reaction by selling too early and miss out on the gains you would have gotten if you were patient and held through the corrections.
How many bitcoins do ordinary people have?
We have more people having none than people having the least 1 sat. We're still early in the adoption of Bitcoin so many peoples don't know about Bitcoin yet or they do but don't believe there's any future for the currency. Some know about Bitcoin but consider it a scam due to the way Bitcoin is been presented by their government and other critics. Don't let the percentage of people having Bitcoin or not having Bitcoin determine if you'll Invest into Bitcoin or buy more. Use every opportunity you have to accumulate Bitcoin but while doing that don't invest an amount that'll make it difficult for you to hold and always reverse fiats for emergency and other expenses.