That's incorrect, with 40+ defence while fully potted your max hit is a 3.
To OP: The demand for these accounts are incredibly low. If you want 40m+ for it you will probably be waiting a long time. For reference, I bought a 1/1/75 account for 25m, and sold it for 35m. That account also had access to blackjack and darklight.
RSC access won't have any affect on the price as RSC has recently been open to any member now. Also for the sythe, not many people care about RS3 on this site.