A) Using copyrighted work without proven owner consent (plagiarism) is strictly forbidden, and you must credit all other artists work. In other words, if you're selling c/p textures or images post a link to the original image.
I) All sales threads must clearly state which forms of payment are accepted, for example "TC only" or "high-value items". Failure to comply with this rule will result in the closure of your thread. Also note that posts inquiring about the preferred payment option are treated as useless, and punished accordingly.