As someone who's entered (and won) creative writing advertising competitions, this prize pool is pretty light on.
Unless your target market is developing countries, most influencers in western countries wouldn't put their time at less than $50/hr. It might take them 3hrs just to complete an entry, and then only one person gets $250?

Also Tezos is a legitimate coin, why not pay out in your own coin, that would help establish that you think it is of its own inherent value. Plus surely it's easier to pay in your own token.

Otherwise creative competitions are an excellent way to create organic growth.