It really depends on the person on how much he or she can really invest his or her money. The profit or his gains will also depends on how much he puts his money for investment. It can be a percentage of one's salary.
yeah it depends on the person on how much they want to invest. But for me if i am the one who want to invest for first try i will invest a small amount to try if the investment site is legit or not. To avoid Lose cause we can't figure it out if the site has no intention to run our money. So i suggest to make try before anything else to avoid ponzi.
Yes thats how i also work. I invest a little amount of money first to check if its legit or if it is a scam. If its legit you can invest more, but know that the site can also not pay you further.
If its scam you can report it so that other people will know so they can do the same. By doing this you will let people know which sites are scam.