Mining is never too profitable in the moment you mine because you are mining with a difficulty according to the price (more or less) but if you start mining today and even if you only get 0.1 per month these days then its not going to be profitable but if in 2 years the price jumps to 2.000$ and you mined 2 btc then you would have 4k$ instead of 400$ wich would be the price right now