Altcoin trading may give some fixed income because altcoin price will be very high fluctuate in the market. But don't think the same thing will happen in BTC trading. As a mate sometimes said it will take few months to go up or down in BTC price, in that situation, we must wait for the right time to sell or buy bitcoins. So in BTC trading don't expect some fixed profit, it will give profit but takes some time.
You seem to be mixing things up. Firstly, in order to book fixed profits after every trading session, you'll need to have proper skills, or be trading with insider information, or be a market mover. Secondly, due to the extreme volatility that altcoins experience, the chances are lower to book profits compared to what is the case with Bitcoin. True, with Bitcoin you may need to wait a longer time, but the risk you expose yourself to is directly much lower, and thus you have better chances of gaining profits.