There are a lot of alt coins in the market, we are nearest in thousands.
But just few here are real and some are just shitcoin or no value at all.
You can check it by your own. If you planning to buy some choose the top 10 alt coins as these have a high market cap and strong support by the community. Analyze the market and these coins.
Yes I agree with you, there are probably thousands of altcoins in the market, but if you are looking for a coin that has good price and popularity like litecoin, etherum, dashcoin, waves, and even now many new coins that have good potential.