In my experience unless you are a kick-ass character modeler and have jaw-dropping stuff it's not going to be worth it to sell your models, especially through a broker. If you sell five a month at $5.00 (which is optimistic for anyone in the lower-price range section) you're only going to see about $2.50 of each sale, which is 12.50 a month. It would be better to keep honing your technique and improving your models by seeing which models people prefer of yours and getting good feedback from them. And then when a lot of people have used your freebies and see the awesome models you have for sale, they might be willing to buy them. Just my thoughts, go with your instinct :)