Interesting point of view.
I'm on exactly opposite end - I'm going deeper with ICO's this year.
Your points are pretty valid, but this mean you just need to be more peaky where you are investing. And I'm always and only buying during the pre-ico phase, avoiding those ICO's with massive pre-sale.
I think that person is not that kind of investor like you that's why he/she want to quit ICO . Well it's not bad when you want to quit investing with ICO maybe you lost a lot that's why but you need to be aware that investing with ICO needs you to become wise. Just like what you did you have the strategy that's why you gained profit.