If you want to argue this then at least use the correct description of the proximal cause, "hits of glutamate in the shell of the nucleus accumbens and ventral tegmental area". It doesn't roll off the tongue and focusing on the neurochemistry ignores the context. So maybe it's better to just say it simply, "If you enjoy doing an enjoyable thing and you do it a lot you'll anticipate liking it more than reality provides on average."