Simply, add a window "Do you really want to purchase Rainbow Orb" as example.
Same with other Orbs, Media Slots, Friend Slots etc.

it's called a gold password.

no... I still don't understand how people "accidentally purchase" shit...
or
report in scammer accusations "i sent fg to the wrong person"

stop doing drugs.

Nothing to do with drugs, sometimes it will happen.
Its just more safety

it's a good idea.. accidentally purchasing a rainbow orb when you had intended to buy a orb of toxin can put you off..

Set a gold password. And turn off auto password complete if you have it on in your browser.