The biggest mistakes developers make that leads to bad ending for many projects are
1. Huge Discounts
Many new projects are still making this mistake over and over again, huge discounts like 50% is insane and it always bother me how the hell the early buyers won't end up dumping since they have already see big profits.
2. Lack Of Solid Products and Ideas
Lack of working products and real use cases is why many investors are not taking new projects very seriously, no one would want to hold such tokens or coins for long, developers need to start working on how their project's token or coin will be very demanding throughout the globe
3. Bad Exchanges
Imagine new projects that make over millions of dollars in ico or ieo and end up listing on bad exchanges with no enough volume, what do they expect to happen?
Giving high discounts is the best way to attract investors so they are doing it but setting a high price and then giving huge discounts from it is just making everyone stupid.
I believe there is no more idea or projects can be discovered so all these projects were having different name from earlier projects and ideas.
Listing on big exchanges may not be an easy task even if they got enough money,because many exchange refuse to list a shitcoin.