I guess it's a matter of opinion. Word count has never been a concern to me, other than whether or not I had a reasonable amount of words when I finished a book. It's not something I think about each time I sit down to write, and I certainly don't check my word count per day - ever.
I do think we all need a way to measure ourselves when it comes to a successful day. I like to write a chapter with each sitting (note I said 'sitting' not per day. I firmly believe that it's best to do in one shot to keep momentum or train of thought) and with that, I'm happy. I don't feel like a failure if I don't reach a certain amount of words, and in my opinion, neither should you..
The problem is that if you set your sights on a specific amount of words per day, what could end up happening is it can become your focus more than the actual writing itself. It also might end up being too wordy, and you'll have to edit a bunch out later on. Also, a lot of words don't necessarily mean it's going to be pure gold.
The bottom line is that I don't like to see any writer put stress on themselves to meet some crazy target because it actually can make writing feel more like work than a project that they love. And if that's the case, what's the point?
