I forgotten a site where I've invested only 1mbtc and got 8mbtc. If anyone knows about it please let me know. also similar sites like that will do. Thanks for reading.
well you know about the ponzi schemes of all types of investment site , further you qant take risk with your btc and want to make a profit . so i will suggest you to you should always invest btc in the newly built site which are giving 10-20% return per day .
No gambling site that I know will give that except HYIP site.In gambling to me the chances of losing is equal to the chances of winning irrespective of the amount one puts in because the HOUSE ALWAYS WIN. Another way some sites put it is that there is range prepared which is denominated in how greedy you are which will be equivalent to how willing you are to lose your money in proportion to the amount of returns you are expecting among other things. But you can try micro betting with satoshis to make reasonable winnings with minimal risk...