Yes I can see many icos but never presales...
I bought ppp and lend and I'm happy but I cannot get in at presale!!
They exist but usually you have to invest much more then the general sale by factor of 10, 100 maybe a 1000.
Either presales are made among strategical investors or people close to owners...
Definatly the truth. Startups like most of the ICO's get a sizable investment known as a seed investment,before they even start their media campaign(website, social accounts, Bitcointalk ann etc.). Pre-sale is always after this investment.