Edit: many of the answers were, whether one should invest in an ICO at all. My question was intended to understand more specifically what's the average person place nowadays in an ICO, IF they participate. I am interested in data, about a typical average ICO investment, not whether anyone should or shouldn't invest in an ICO.
Those days when I did ICOs I was particular about risking just $100 on any project that caught my fancy. So, how many coins that could buy then depended on the project's going price. That's on my average spending. There were instances when I risked less like in the Electroneum ICO where I vested a mere $30.