Does Burning Tokens in a sale lend legitimacy to an ICO?

[ico41]

Is it necessary, in your mind, for a token sale to have a policy where unsold coins will be burned to protect the value of the token? What do you think of the ICO's which retain unsold tokens for "future development" or "ongoing issuance"? Do you value those sales less for that policy?  Or is it too simplistic to make a determination based on that, and there are legit reasons for retaining tokens during a sale for the future?

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[Felics]

I think it does. Burning tokens adds a significant way to increase return.

I was wondering however, given the SECs new rules on burning tokens and dividends etc, can ICO provide burns anymore?