Well, It seems the tokens that are being sold now on ethereum network are not the one that are going to be used on the EOS blockchain later. I don't really know how they can be of such value right now, I guess that's one of the reasons why everyone says it's a scam. Personally I don't think someone can come up with something delicate as this without the intention to actually build it.
I don't think it's a scam. I think they will map out the EOS tokens onto the cryptographic tokens on the EOS blockchain.
I'm more concerned about their ability to enable parallel processing.
The biggest selling point of EOS is its claim that it can process millions of transactions per second. To do this, Larimer said that they will enable parallel processing. PP is extremely difficult. It takes teams and teams of programmers to enable this on a single computer. I don't see how EOS is going to do this over many distributed remote computers.
I read their white paper and it does not explain how they will achieve parallel processing. Based on such little information, the probability is that they will fail. If they fail, then EOS will be similar to Bitshares.
Maybe they know more than they are disclosing in the white paper. If they pull off parallel processing, it will be a monumental achievement.
I think this is the biggest risk with buying EOS.