Well, in vain, I once was at such events, and you know, I witnessed how one project (I will not disclose the name, maintain confidentiality) for one evening received not only several investors, but also interest in further cooperation and development. I think it's worth the risk and invest in their speeches and presentations. So there will be a lot more sense.
Of course, you also need to look at what the competition is and what the presentation is ... Sometimes it makes no sense to participate because such contests have one goal to raise money from the participants. But you can not think that all projects are. Need to participate. This is very important for the popularization of the project and the integration of the project in the cryptosocommunity.