I use to put half of my income into Bitcoins.I save small earnings which i get from signature campaign and invest them in trading.In future, i have plan of investing more in Bitcoins.
If you are saving all your earnings from signature campaign and putting that money into trading then I think that is the right thing to do, as eventually it will allow you to grow your bitcoins in long run and as far as you are not putting your all income from fiat in bitcoins you are at safer side as putting all money in bitcoins can be risky in long term.