Are there any altcoin traders who actually make money on the long run?
How much do you make in a month (in percentage)?
What are your strategies, e.g. how do you know an altcoin is worth investing in?
Share your secrets, we are all bros here

Yes I could made good profit on trading altcoins on poloniex, usually i could got profit about 5% monthly from capital
my strategy trading was buy on support area and sell on resistance area,
i choose the altcoins that has big capitalization please check on here
http://coinmarketcap.com/ my secret in trading is just patience and follow the trend of price.