More liquidity and volume is a lot better than less, but there is a great deal of usefulness to being listed on an exchange with no existing volume. The listing wouldn’t get new people exposed to BlockShares, but it will allow people who know they are interested from this forum or bitcointalk a way to buy or sell BlockShares. It is a lot more liquidity than what we currently have, which is forum posts. Because more volume is better than less, an optimal reward model probably provides some extra incentive to a listing on an exchange with high volume. It is certainly worth more to us.
The post about Crypto-Trade combined with seeing that it is new and a likely scam brings our attention to the relevance and value of the rewarded exchange having a track record demonstrating a scam is not likely to occur.
Perhaps @Financisto or @Dhume would like to craft a motion amending the reward offer by taking into account the history and volume of the exchange. There are a variety of forms such a motion could take that would earn my support.