In fact (at least how I see it) , selling stuff when Bitcoin price is low is better then selling while it's high . I will give you an example :

I want to sell something for 300$ now and the price of BTC is (150$ per BTC right now) , that makes it 2 BTC
Or I can sell it when the price of BTC is 300$ per BTC and only get 1 BTC .

So because we have to make USD conversion , It's better to sell while price is low if you are planning to keep bitcoin for long term like I'm planning  to do so yes ... earnings this year may be lower then last year;