TLDR: Consensus has become a cesspool of ICO scams.
Have you looked at the agenda? There aren't any ICO's there. Not saying the conference is good. I'd say there's a lack of good speakers (such as Andreas).
There's a lot more to a conference than just the official speakers. And among the speakers, there may not be any ICO salesmen, but there are plenty of shitcoin shills and representatives of "blockchain" companies.
Hell, Roger Ver would be a speaker there if it wasn't so hard for a convicted felon to get a visa.
https://www.coindesk.com/events/consensus-2018/agenda/