I haven't asserted that it should. The private market should work just fine.
if you would not have the will to do it without the aid of others, perhaps it means you should not do it at all.
Any individual confronted with such a situation may very well be physically incapacitated. Remember, the only people who should be considering such actions are those who simply can't go on because their bodies are so far gone, that the only thing they are capable of is bedridden suffering in the short time they have left before they expire. If they were well enough to go meandering around shopping for the best method, they most likely aren't sick enough to need euthanasia in the first place.
I believe it is cruel and inhuman to compel such a physically incapable individual to attempt what amounts to homemade surgery without anesthesia or competent medical staff and established procedures. Brutal, botched suicides would occur, with further pain and suffering as the result. Ironically, it is pain and suffering the person is literally willing to pay with their life to end.