Imo best way of earning btc is ICO, bounty, events. Allways invest money that i afford to lose, if necesary.
A good way to start is a new exchange.  You  take it from zero and you earn assets by joining bounty programs.
I'm into bitpaction.com . They have bounty and ambassador program plus multiple events and their exchange when adding new coins.
And if you hold BPS can be a good advantage in trading fees and airdrops.Take a look here: https://bitpaction.com/#/events/competition
I'm very happy with this.