They fixed a major glitch with the DC a week or so back. It's totally worth it now. Haven't got any Alchemy stuff in a while, but I'm not seeing any crap like eyeballs, summer shirts or mexican themed pants either.
While most of the time my DC is the standard 50+ gold, tickets, fish bait, cheap crap... I have on occasion lucked (like the time (months ago) I got a back-wings formula before they changed how alchemy stuff was distributed ^_^)
Free stuff is.. well Free... I'm not knocking it, I don't have time to hard core make money, so every little helps.... I usually clear out the junk once or twice a month.... it may not add up to much... but it is still free so all good to me.
I very rarely, if ever, see anything but the usual common prizes/gold/aquarium fish and items. I get a lot of aquarium stuff for some reason.
Once I got 10k. I thought that was the best thing ever. Then it handed me a Silicon Pirate back when they were still pretty hard to come by. Of course, I was stupid and didn't sell it. That remains the best I've ever managed from the DC.