Hi I have a quick question for you Bitcoiners out there and cryptolovers alike:

I use the site "Gigacoiner" which is basically a HYIP that allows me to receive a 210% return on my BTC over the course of 30 days. I noticed on the site that you can change the compounding interest percentage on the individual investments.... Does anyone have any idea what this signifies?

For example, what would the daily profit be (over a 30 day period) at the following compounding rates?
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%

Also, since they operate and make their money on arbitrage and ask/bid spreads, how would this affrect the security of my money, if at all? Thanks in advance!