In that case: An unmanned kamikaze ship still needs the mass and size of a capital ship, it needs sublight engines and a hyperdrive and it needs an advanced piloting system. It has to stay with the main fleet in case it’s needed, so it costs additional money to operate. Why not buy a regular ship for the same price, which is much more versatile and not limited to one single use? And don’t tell me “it’s just a joke”.
It’s just a (very stupid) joke.