Bitcoin is actualy worth something. They have larger community than all other cryptocurrencies combined. And most important thing about Bitcoin is that you can actually buy stuff with it. Beside that Amazon will be accepting BTC in about 6 months.

DOGE has (spam-)hype, CAT has only few miners. Does that make it worth something? Mybe at the moment (hype), but I can't see it in the future. New coins may be ok for speculators, but they are best suited for first batch of miners. In my opinion neither are worth what ppl are asking for them. And the reason why ppl overpay is:



If you're looking for long time investment, you should stick with BTC/LTC.
If you're looking for short time investment, buy AMD stocks and sell by the end of JAN.