It's usefull to me, I get gold and tokens and inks, and sometimes clothes. I have gotten 200 gold twice. it's definatly worth doing it every day. if you do it every day, your chances of getting better stuff increases.
I've gotten some pretty good inks and one time I got 10k at once and I heard u can get npc underwear from there 2 and my friend has gotten 50k before and some really rare items like that sell for 100k on the market place