The problem is not how much money you put into it, but where you put that money. I would not even consider it an investment, unless you're referring to casino bankroll.
I think this thread refer to bitcoin casino investment because it is located in the gambling discussion section. [1]I wonder why people still use their money to gamble when they can invest. [2]Everything could be started with a small amount , well I mean reasonable amount not only with few satoshi investment of course
[1] Most of people are always want easy and fast money, that is the biggest reason why they prefer to gamble their money instead invest it on gamblng sites. They don't have any patience to wait their money grow while they have invested their money.
[2] The reasonable amount imo is 0.01 btc and they must keep re-investing this amount until they are really have "reasonable amount"