Why invest in altcoin when you can invest in real estate, stock market?
I will just leave here a picture with the best in profitability cryptocurrencies for 2017, the income is specified as a percentage. If you can give an example of any asset that can compete with these numbers, I will be very surprised. For example, if you invested $1000 in XRP at the beginning of the year, you would get $360 018 at the end of the year.

Where do you get this data? it is very strange for bitcoin to be in the lowest position, when in 2017 bitcoin price reaches $ 20,000 up almost 1000%. I do not believe in these statistics if you do not provide a reliable source. And now Ripple slumped, the price is not yet up to $ 1 because many know Ripple is working with the bank, and some people think Ripple has a centralized system.
My experience of investing in altcoin or bitcoin is very profitable compared to investing in real estate, stock or anything else. Investment in cryptocurrency is simple, and does not pay taxes.