waves is already more than $0.50 which can be too much. one with just $100 can't have more than 200 WAVES out of it. but with XEM, its more than enough to have thousands of it. its more than profitable to invest to it that with just minimum growth of $0.05 can be a sign of celebration. 
The absolute value of a currency unit is completely irrelevant. What you're interested in is the relative growth rate. Otherwise, following your logic, BTC is overvalued because you can only have 0.05 BTC for $100.