i think whats proabably happening, is the same for most people... you do the enjoyable bit, then when you get stuck / bored / pissed of with the track your just starting a new one to get the enjoyment back... I did this for years.. it does some self discipline to make yourself finish them, after all none of us like doing something thats not enjoyable.. id probably say its 50 / 50 enjoyment / frustration ratio with me...