I think we need to look at both way..

牛仔很忙 mentioned similar issue
http://bbs.wenxuecity.com/finance/3473541.html

it really depends on how much money you are doing for trading daily, also how much time you have for trading each day..

If you have 10 billion for trade, it is very difficult to trade that much amount in one day.. of course if you don't have time to trade each day..

So there is still a difference between day trader and long term investor.. there is no way you could compare with day trader with Warren Buffett kind of investors..

I think the key is still how much percentage portfolios you like to do for the risk.. Warren Buffett did not make profit for every investment. but he made most of the investment right and did not risk his whole portfolios..

Also we could see not everyone is perfect, even Warren Buffett.. so don't be too hard on each other on DQ.. people come here is to learn, have fun, and making some money as well..