So long as you don't use a level fresh accounts RuneScape Gold for sale, you won't be exiled. Except if you bought illegal osrs gold that was taken from an account that was stolen.
as insofar as I can tell there are legitimate websites selling safe OSRs gold that were sourced by Green Dragon Kill, there are gold farming companies that are professional in Asia countries, and although the prices may not be the lowest however, gold is secure to purchase. Jagex isn't going to prohibit. You can test some of the most well-known runescape 07 gold stores like RSorder.com, RSorder.com, p2pah.com They actually do business.