Bitcoin may be counted as investment itself because of technology behind it.
Also I don't suggest go other alt-coins. They will be all dead in sometime other than btc.
Yup Alt coins are wasting investment. Putting investment in alt coins are like you itself digging land for your burial. so I would suggest Bitcoin for your future invesment Its sure Its worth for money. but not alt coins as you said.
I would not be so sure. Some Altcoin can be pulled by Bitcoin into the mainstream. The most likely are Litecoin and DASH, but for example porn industry can adopt sexcoin or eroticcoin (just an example) - it is very likely. So such investments may in the future prove to be the best.