i agree there is far more profit in trading altcoins than there ever is in trading bitcoin. sometimes there are altcoins that go up 10 times in price. the hard part is to catch them when they are still low and buy as much as you can.
Yes altcoin will give more profit but there price will be some times increase and some times decrease so but when it's low> Bitcoin not like that price is not decreasing since last 1 year it's huge increment but getting bitcoin for low price is bit difficult you should search and buy. Bitcoin trading is safe method i think.
"Investments" in altcoins can be seen as gambling as you need pure luck to make some profits. The majority of the people just buy themselves some altcoins hoping they get pumped real hard. That's not investing, that's gambling. Investing in Bitcoin is a much better option as it has a future. Altcoins will end up vanishing after some years.