Small investment only for people who want to test out site's profit summary before invest bigger amount, IMO
If you want to made big profit, you need made a big investment ( dare to take the risk or nothing at all ! )
Small investments can work because in gambling winning chances are low so you don't have to face a big loss in case of loosing a bet, the more you invest the more you lost. Though investing small amounts gives small profit but it's good for a gambler if he don't want to loose big amount.
Good input on investments versus gambling. Though we should really consider that gambling is a chance of winning or losing. You get to try to win or not, and if you lose you lose 100% your bet. In investment you lose only a portion of it and not really the entire investment you put in. Also, there is a higher chances of losing all the money in gambling than investments.
For me, this is better as all we want is to have a constant income that will not give us a limit on how much we can earn.