In my opinion, it is, because it can show investors that the team is ready to bring huge results and has future plans.
As an example - KickCity, event platform where each user is rewarded for event promotion. You can try it today. More information you can find here https://medium.com/@kickcity_io/kickcity-public-beta-5aa66fafc5c7
For me, one of the main criteria for the appropriate choice of a reliable project is the availability of a finished product. Sometimes I am unpleasantly surprised by projects that promise rapid progress, but do not have any stable product.