So a better question might be: why is Ethereum not experiencing the same levels of hype and price growth as Bitcoin right now?
My guess would be that rising ICO anxiety is causing enough flight from Ether to other currencies to suppress any hype-induced price bumps.
The ICO craze seems to have peaked and to be in rapid decline now with many governments cracking down or threatening to crack down on fraud so it is doubtful that ICOs can really bring new money to the table at this point.
The other big question on Ether (for me) is the talk about going from proof-of-work to proof-of-stake. That sounds like something that would sharply cut the price of Ether, which is good if you want the network to actually be useful, but bad if you are a speculator.
Why is that? I'm pretty uninformed on this stuff...I get that POS basically replaces risk via electricity cost with risk via an Ether stake...but I don't get how it changes the supply or demand...