there are 365 days, so make sure you earn at least 0.00273972602739726027397260273973 BTC/day, and that is very easy. My sig campaign pays you almost that much /day.
★ JR Member: 0.00007 BTC per constructive post. 20 Posts max per day.
you only receive 0.0014BTC/day (if you can maximum post)
so you need 2year to get 1bitcoin
Yea I said almost. Plus you forget that you rank up to at least senior member by the end of the year, so you will actually earn much more.
With senior you can earn 1-2 btc/month already, so add that all together. I`d say about 5-6 bitcoin can be earned yearly only by sig campaigns.