Not really, again it depends on how you value your bitcoins. Mining itself cost money (electricity + gpu card) so one has to constantly make sure that the mining done is worth the bitcoin investment. For example, if you believe that bitcoin will be valued more next year, mining (or buying) bitcoin as much as you can may be a sound investment because you'll profit more despite the cost of mining. However if you think the market will crash and people will eventually get bored with the Bitcoin fad, then selling the bitcoin as soon as you can mine them may be better. Who know if bitcoin will be worth 100 USD = 1 BTC or next to nothing by next year.
Well, the problem is the "if you believe part". Bitcoins are a high risk investment. I really mean
high risk, as in tomorrow the price could double or halve and I wouldn't be surprised. Or the government could issue specific regulation for e-currencies and this would be all over.
But politics aside, if you can't make a reasonable prediction for tomorrow, how are you supposed to guess the price next year? It is completely random. But give it a shot if you can support the losses...