nomadomatic
This is something that's always perplexed me. Companies copy other companies' business models and compete for the same customers all the time, but that's considered fair game. But if a design is copied, shit hits the fan.
Frankly, I'd rather someone copy my design and go after a diff niche of customers than copy my product and come after my customers.
To the guys at Curebit - ignore this noise. The focus should be on creating an awesome product, getting paying customers and generating profits. You guys have an awesome product and deserve the funding. Congrats :)
P.S. You should remove the hotlinks tho. No need to use their bandwidth.
Did you consider letting the buyers and sellers do the leg work?
Setup a distribution center. Sellers who want to offload stuff scan the items and their details to you and you give them instant, fair quotes. If they like your offer, they bring the items to your center, and you check to make sure everything is as it was stated.
You put the items, their details and their new prices (with your margin markup) online for buyers to peruse. If interested, they'll come by and pick up whatever they want.
Like an online pawn store w/ local centers, except there's no pawning, just selling & buying.