RWT is not just against the Jagex rules, but in OP's example, it is also against the EULA of EVE Online:
"B. Selling Items and Objects
You may not transfer, sell or auction, or buy or accept any offer to transfer, sell or auction (or offer to do any of the foregoing), any content appearing within the Game environment, including without limitation characters, character attributes, items, currency, and objects, other than via a permitted Character Transfer as described in section 3 above. You may not encourage or induce any other person to participate in such a prohibited transaction. You may not use, transfer or assign any game assets for games of chance operated by third parties. The buying, selling or auctioning (or any attempt at doing so) of characters, character attributes, items, currency, or objects, whether through online auctions, newsgroups, postings on message boards or any other means is prohibited by the EULA and a violation of CCP's proprietary rights in the Game."
https://community.eveonline.com/support/policies/eve-eula-en/
