There's no question that it's been a good investment, particularly if you bought at the right time.
I think that pretty much proves that it is a good idea to buy a bunch of different alt coins in the chance that they go to the moon also.
Look ate ETH being worth 1USD and the highest was 400 something. An update is coming out soon for ETH also so that remains to see if it will rocket up again.
Anyways, bitcoin should still be a great thing to invest into as it has the hash power and security of a HUGEnetwork therefore making it the best choice.