Having no knowledge on the matter, what's the price comparison to just buying ketamine illegally and taking it without a doctor's help?
Depression is like (or possibly is) a form of chronic pain. People suffering from it severely might be willing to do anything for relief. Here's good information that a currently-illegal drug can help but if you want to do it legally you might need to take on a third job just to pay the costs.
It reminds me a bit of the South Park episode[0] where 'concentrated dose of about $180,000 shot directly into the bloodstream' is discovered as the cure to AIDS. Volunteers inform poverty-stricken Africa that all those suffering from AIDS have to do is inject themselves with piles of cash.