Even though he is bullish on the cryptocurrency market in general, legendary financial expert Ric Edelman says meme-inspired cryptocurrency Dogecoin ($DOGE) is a "scam" that will end "extremely badly." He believes cryptocurrencies are "very, very quickly" becoming mainstream, and that while they are "not quite there yet," they are far more popular than they were a year ago. Investors should allocate up to 1% of their portfolios to cryptocurrencies for now, as they are risky assets, according to Edelman