At the end of the day, it all depends on how you are measuring your "success" in trading. Are you looking to get rich and be able to go buy all the things you want? Then all you really care about are the USD pairs... Why would you care how something is trading against the BTC? You would just have to convert the BTC into USD anyway in order to spend it (unless you are buying things online using BTC). I for one am a speculator and looking only to make some USD so I can go and buy normal things in my everyday life. Thus I don't care how IOTA/BTC is doing... I only care how IOTA/USD is doing.