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 .