BDL is a legitmate Bitcoin Doubling system that takes 800 days, regardless of the Bitcoin price fluxuations..
As with most things, yes. For example, we had several of our investments fail in the past (HashOcean, BitMinister, HashPoke).
In December 2016, we spent around $1,000 on Google Adwords for our Xcoins.io account and got over 1,500 referrals and over $2,000 in Bitcoin back in commissions. In addition, we still earn $30-$100 per day in Bitcoin from that single investment. We were invited to the official Slack support channel by one of the Xcoins admins and are active there as well.
We also launched a game at http://ethereummining.co.in and have over 40 other websites we own and operate.
Bitcoin, Litecoin, and Dogecoin.