Because the Ethereum developers aren't experienced altcoin devs. This was their first altcoin. They have no connections in this industry. No one on the Ethereum team knew anything about how to launch a coin. They used a horrible difficulty adjustment algorithm. They had 0 pools at launch. They did PoW instead of PoS.
I have read the Ethereum code and it is quite basic. It's very similar to Bitcoin. I was really hoping for more from Ethereum but it looks like they just reinvented the wheel and added in a new feature. It's heavily over priced right now.
They ripped off people. I have no idea where that $18,000,000 went that they raised. This project could have been built for $2,000,000 and 8 programmers. They then premined a bunch of coins for the developers even though they got paid $18,000,000 already.
They should have gone PoW & PoS hybrid but they weren't smart enough to build such a thing. They now had to hire the guy who invented Synereo to help them make Ethereum better.
I could never recommend selling Ethereum if you own it because it has such big potential but I'm definitely looking for the next big project that can deliver on expectations. Synereo looks like the next big thing as of right now but after researching them more they are big supporters of NATO (No Action Talk Only).