1275 bones per prayer brawler frost bones: 1,204,875 xp, 21,165,000 gp, 1 hour dragon bones: 481,950 xp, 6,489,750 gp, 1 hour to make up the xp difference between the two (722,925 xp), you would need to offer 2,868.75 dragon bones, valued at 14,601,937.5 gp, which would take about 2.5 hours. using brawlers on frost bones: 1,204,875 xp, 21,165,000 gp, 1 hour using brawlers on dragon bones then train w/ dragon: 1,204,875 xp, 21,091,687.5 gp, 3.5 hours gp saved using brawlers on dragon bones: 73,312.5 gp extra time spent: 2.5 hours income required for dragon bones to be worth using on dragon bones: 29k/h -- tl;dr: frosts might not be the best choice for you for regular training, but they sure as hell are the best choice for use with brawlers