They're not, they're not even a reward, they're a punishment for doing events and generally playing the game. A reward is something you want. An action figure is something that you can't delete on pick up, can't sell to a vendor, have to search though your inventory to find and throw away, and thus are objectively worse than mods. Completing an event and seeing a glowing circle is a very rare occurrence and so getting slapped in the face with a useless and pointless AF is just trolling at this point. If you insist on inflicting these wastes of space on us at least stop pretending that anyone is at all happy to see them.