As they offer a service on SteemGigs, here are some of the benefits:
They got rewards courtesy of the post itself.
They get added reputation, courtesy of their abilities, expertise etc
They become searchable on the SteemGigs database
They get rewards from potential clients, who avail of their SteemGigs
They present themselves ever constantly for opportunities etc
They hone their existing expertise or craft, while helping others build their dreams
They can stay in the steem ecosystem financially, even when they aren't blogging
etc

that's why I made my own on Steemgigs
Feel free to visit it, https://steemit.com/steemgigs/@franbel/do-this-personalized-realcartoon-photo-editing