Is it profitable to buy coins when presale?

Do you have thing to buy a coin at presale or ICO or crowdsale? What ever they called. Even they have good project, good team, good partner, big and strong community?

What is pre-sale for? Usually the team of coins doing presale are for collect fund to payment listing their coin on exchange, NOTHING ELSE. But how if they failed on presale ??
● for who have only fun project or really scam project they will disapear, For firstly we must have to analist all the thing about their promotion. Not just only whitepaper, roadmap, real project, law of their project, but also who team behind it. disactivate social media for first sign if they had scam. They run with some money from few investor.
● for who have really project they will pay for listing their coin on market, its name plan B.
Not really matter if in this case, few lost when trade it on market.

What is the effect from presale?
Some investor who is also trader will sell the coin on market after launching. Than the price of coin will fall in deep, basic on another trader will put buy orders on very cheap price.

The team for who have good project and strong community, they not need presale for listing payment, they can pay listing on market using their own money, what the effect is ? Price of coin can stable for long time. Coin like this we must find it to invest or for trade it.

Sorry cannot says who is the coin had scam or will scam, if you have suggest who will scam please do not hesitage to reply this.