What are some of the best marketing techniques that you’ve seen used for crowdfunding campaigns?

The key lesson I've learned over the past decade in the industry is that your campaign needs a marketing budget. I believe that with rare exceptions, a successful campaign needs a marketing budget equivalent to at least 10% of the total raise. One-third to half of that will need to be spent relatively early in the campaign.

Given this requirement, it is important to price your offering in such a way that you factor this in upfront.