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.