Yea, that's actually quite interesting, would be interesting to see how it works out for you.
I've actually been doing some "historical" gaming posts lately, covering noteworthy games released in certain years (just made two about 93 and 2000) and as I remember RS was around for a long long time already and people have always been selling stuff there. Also compared to most other MMOS RS is quite unique in a way that you do not necessarily need to be a warrior, you can play peacefully just fishing cooking crafting etc.
Do you enjoy the game or play just for profit?