When free trade got announced I started suicide botting two stakers. A 1 prayer melee staker and a 11 pray (ancients) mage boxer. Around a month after free trade was there my melee staker was at 90 att 90 str 90 def 99 hp @ cb 105.9 MAXED for it's combat. Worked extremely well as the amount of other 1 prayer stakers was still relatively low at that point. My hitpoints made me win most of my boxing stakes and the balanced stats just worked well.
I staked to get RSGP though, not to sell RSGP. Spend all my winnings on getting 92 herblore twice, 95 prayer twice, 99 magic + 99 smithing twice (gold ore superheating).. Oh well
Currently making a summoning tank to stake for real life profit really.