There is no requirement to be rich to invest. The only thing you need to invest is the desire to invest. For some, an investment of 10 dollars is not an investment but for others, an investment of 10 dollars is enough.
Not everyone has the same expectations from the market and the amount of profit to be obtained as a result of the investment is not the same. There is a price that you set and you invest as much as you can afford at that price, and when the price increases, you sell at the level you want, and you are the only one who determines it. Investment involves many things and is an environment where everyone's expectations are not the same.
It depends on the amount of money a person has so if a person is wealthy enough then he can manage all the things very easily and 10 dollars will be very low amount in his opinion but those who don't have enough money will gather these 10 dollars with great efforts and through minimizing his expenses.
Those who achieved success from coins will always prefer to invest more amount but those who are new to the market or lost money they will be afraid of losing money so they will initiate with lower amount of money. There are many reasons behind the lower and higher amount of investment but we cannot understand about the thoughts of others buddies.