According to coinmarketcap.com there are 668 coins on their site all trading. Do they all do something different or are there a lot of copy cats and if so, what do the 100% copycats have value?
Please show example if you can
Obviously not. 99% of coins do not offer anything that's worth holding above bitcoin. Some coins, offer some creative stuff, like Maidsafe, Byteball, Monero, Ethereum... but is yet to be seen if any of these have any realistic long term value.
For example, with sidechains, Bitcoin can do everything Ethereum can do (via Rootstock). What's the point of holding ETH then?