It is totally worth it when a side projects gets serious, our hackathon project made more impact than our main product
However a growth hack for 3Crumbs evolved into http://Justmigrate.com We treated it as a hackathon project, had full freedom to ideate & execute. We build this after hours for a month & it was a great success. Lot of users loved it & this bought tears in our eyes :).
Weekend hackathons are important, it lets you think out of the box. Now our original product is seeing lot of evolution for better growth.