Strategy!
Let the AI send convoys to your planets. He uses money and fleet for it, thus weakening himself.
You get the production bonus, it's a win-win situation ^^
Pirates? You can do 2 things with pirates. Buy a mission from them, and put bounty on other peeps in order to get pirates to attack them.
You can buy pirate missions and send them on an player you got peace with, btw ^^
So if player A gets the bounty pirates on them, you could buy some more pirates to attack player A, the more the merrier, no? ^^
You could buy pirates to attack player A on planet Y, while you wait and prepares an assault on planet X, when he's occupied with defending planet Y from pirates.
But never buy the pirates to attack planet Y while you do the same. Pirates tend to ignore who bought them and will thus fire on your ships and player A. Would be money down the drain one way or another ^^
And last
Quote
"I love the idea of backroom deals with other factions to turn against common enemies who may at the time be allies. Tricking factions and corrupting them to your needs is great in diplomacy!"
How do you trick and corrupt the AI?? Gief build