It all depends on what you purchase the OSRS Gold from. I typically stay away from large websites that have unlimited stocks in a variety of games (usually Chinese traders too). If you browse the RSorder marketplace, there are a lot of players who are selling their Gold. You can not only expect the most competitive price and the best quality of service, but the transaction system built on Escrow ensures that you receive the price you pay. In addition dealing Gold with other participants (even in relation to RMT) will be the safest method!!
To see this working, head to your live site.