Depends on the ICO itself, sometimes they have limited token supply and I think their target soft and hard cap has something to do with the price as well. But I think there's still ICO that offers less than a dollar per pop and hope that they can take off once a working product is presented.

That's why investing in ICO right now is like a gamble, you will never know if they are a scam until you really found out at the end that they have already run off with your money.

If you think that some ICO are getting expensive then simply don't put your hard money on it.