Iam not a economic expert but this seems like a HUGEEEE increse in such a short time..
Correct 
During the past few months, purchasing bitcoins would have been a better investment than pretty much any stock share or commodity (well, except going short on Facebook with some leverage derivate perhaps
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Anyone knows if the price is going to go down sometimes, or will it just continue to raise?
Obviously it will continue to raise and drop over time. Remember, it's been over $30 in the past. But unless the entire Bitcoin concept somehow fails miserably (which I consider extremely unlikely), I am quite confident that in general (other than any small scale temporary ups & downs) we will see a huge, HUGE raise during the coming few years.Which is one of the reasons why I converted a significant share of my savings (formerly in euros) and stock investments, into bitcoins. But not so much because the amount of EUR or USD they will be worth - I hope I'll never have to swap my bitcoins back to fiat money anymore, and at some point in the future I can just pay my living costs in Bitcoin.
its probably unwise to put too much in at the moment- the market is small but growing. there are a few arbitrage operators trying (allegedly ) to move the market up then sell causing a fall and buy low!! however long term BTC can only increase due to the limit and increasing demand. when the authorities really catch on that its the end for their control over well everyone they will fight like cornered cats to stop it-but I do not think they can!. reg.