It's so easy to make one, does it make sense? But think about it, Bitcoin and Litecoin are the same thing.
Some altcoins serve a direct purpose. I can see a future for LTC as being used for microtransactions and even Doge is good for it. The only down side is that Dogecoin is now crashed in price so it makes people scared to use it. Maybe if it is stable for awhile we will see some good results. BTC costs too much for transaction fee of .0001 to use for micro transactions.
For micro-transactions with bitcoin, you can use do it with offchain tx.
For example, you can send a tiny amount of bitcoin from your coinbase account to someone else's coinbase account without any tx fee and instantly.
Yeah, but for that you'd have to find someone who has a coinbase wallet, that's a big inconveniance. Plus, everytime you do that you sacrifice the decentralised aspect of cryptocurrencies, and instead you put trust in a central entithy in exchange for cheap transactions.
In altcoins, the cheap transactions are built in and decentralised, which makes it much better.