This is always a good consistent money making method that only gets better as time goes on. that said i only did it once just to get my own pair of boots and stopped just because i cannot stand the telekinesis room. all the other rooms are fine and i suspect if you could sub out the telekinesis room for another room at 2-3x the point requirement the boots wouldn't be so high since more people would do it.
it was like that back when it was 18m since its been in the game for 5 years now "equip a cavalier and infinity boots" i suspect its just due to rs3 inflation and people are valuing their time more so the boots had to go up
sounds like good money, but there is just somethings in this game that is so annoying to do and this is one of them tbh..... there is a reason they are high price cause no 1 wants to do this mini game unless ur a bot lol...