Hi-fi systems get up to prices that are unbelievable. It's perfectly possible to pay £3000 for a record player, and the real buffs do so without flinching. Once you get to a certain price range, then the 10% that one is supposed to pay for the interconnects and speaker cable comes to a lot of money. those riser things look like snake oil though.
NB - I am not excusing these people's idiocy, but they probably think that paying over a grand for a bike is equally odd.