not disagreeing with you but there's quite a lot of room between $0.00 and $700 you don't always need the most expensive placebo, just something which is deeme

not disagreeing with you but there's quite a lot of room between $0.00 and $700 you don't always need the most expensive placebo, just something which is deemed to have value and not free or without effort for example, saline solution which 'burns' a little when injected is more effective than simply injecting pure H2O, so in the sense that it generates slight discomfort it is not 'free'