[Suicide Junkie]

That is an interesting idea.

It should be noted that tiny planets can easily have hundreds of thousands of hitpoints already, due to troops acting as planetary armor.

1% hit rates would require tens of millions of damage points to be thrown at the planet in order to clear it. Not a bad proposition, actually. Rollo's AIs seem to be fairly good at dropping troops, so it shouldn't be too much of a problem for them.