Sure there are alot of devs that will dump their premine onto the exchange which kills alot of these altcoins. But I believe if a dev is really using a premine for the benefit of the community then what is the harm in it? A dev should pay for the development of a coin from his own pocket, pay for the promotional costs of the coin from his own pocket and then also mine a coin he developed from his own pocket then that makes a legit coin?