Dividend investing is somewhat self controlling as most people watch %-yield. If lots of people buy in, share price goes up and yield goes down. Suddenly it's a bit less attractive and people stop buying. Share prices may settle back down or the dividend may increase - yield goes back up and it again becomes more attractive. All related to risk of a certain stock, but %-yield is what really keeps things in check. Most people won't buy an Altria (MO) at 0.5% yield, or Annaly (NLY) at 1% yield. These types of things really make it dividend investing a good long term strategy and somewhat immune to bubbles - only heating up and cooling off.
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