if somebody has bought but not bought enough to move the market, that entity will buy more when it has a chance. if you buy after many such entities, they will protect their entry point. so you will have protection of the entire market WHICH YOU NEED
Yeah, but you should think one step further. Those entities are not interested in protecting weasels like you (or me). So what do they do? That's right, they violently shake the market up to get rid of you and usually at the worst possible places. Plus, if you've been at this for a while, you would also know that more money can be made from these violent shakeouts than from clean trends.