Terms of ether sale:
https://www.ethereum.org/pdfs/TermsAndConditionsOfTheEthereumGenesisSale.pdfclause 19.9
Risk that Ethereum Platform May Never be Completed or Released.
Purchaser understands, that while Ethereum Team will make reasonable efforts to complete the Ethereum
software, it is possible that an official completed version of the Ethereum Platform may not be released
and there may never be an operational Ethereum Platform.

Lmao, that clause reminds me of all those IPO scams that happened, always there for CYA purposes.
However I think its different with Etereum, I have faith in the team. I've generally been pretty spot on about my choices in crypto and I'd definitely get into Ethereum. If you dont have much appetite for risk especially after all the scams that happened, i would just throw in 1 Bitcoin or half a coin and see where it goes.
Worse case you lose that much, they get filthy rich and you work for a few hours or a week (depending on your income) to recover that

Ethereum is revolutionary and can bring p2p to the next level.
Edit: I'd like to mention that despite backing Ethereum, I am dissapointed with the IPO/sale pricing, since it has high risk given the maths, of not returning much to the investor (who took the largest risk)