I try to cover my bases, on anything that might be valuable in the future, so I purchase alt-coins and hold them like I would bitcoin. I usually just look at the total market cap of the coin and whether it offers something new, or has potential.
I have at least a millionth and sometimes much more of Ripple, Ethereum, Dash, Bitshares, Maidsafe, Next, Peercoin, Monero and Counterparty.
I also have some exposure to Litecoin, Dogecoin and Stellar, but don't see much point to them beyond network effect.
Looks to me you rather gamble instead of doing research and going for a couple of really good coins.
Buying a good share of all the most established coins isn't gambling, it's insurance. I do research all the coins I purchase, and if you go into any of the forums for any of those coins I listed above, they all think they're the next big thing.
The cost to own a millionth of most of the alt-coin networks is insanely low. If I want to cover my bases, why wouldn't I spend 20 dollars on a top 10 competitor that gives me the same share as owning 21 bitcoins on the bitcoin blockchain?
Can you list these "couple" good coins that are a sure fire success over the coins I purchased above?