Primarily to get a discount from the project.

Although I always dream of trying out my luck, unfortunately it is something I cannot afford right now. I now only pick coins that are more or less stable and have less risk involved. The coin needs to have a real world use, a real solid team, and good marketing.

I wouldn't know why people why buy an ICO just for the status of an "important investor." Lol. Seems very childish to me.