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nomad said:
People often point to "free-marketing/ads". Yet, I don't think anyone has any data of this yet. For all we know, lets play videos actually lessens games sell, we can't know for sure, but the most likely case is that it makes no difference at all.

One would assume that most marketing departments for devs and publishers would have collected this data and analysed it. The fact that other publishers and developers generally don't interfere with youtube content suggests that it's generally beneficial for them.