He's like,
f-you Jon Arryn,
f-you, Robert Batheron,
f-you Stark,
f-you Lannister,
f-you Batheron again,
f-you Stark again,
f-you Lannister again,
Starts getting a little worried about Daenerys
Grabs a female Tully-Stark
Turns Lannisters and Highgarden on each other
Highgarden complains. Sorry, you are not part of my plan, Highgarden.
Sends a false Blackfyre toward Westros. "But I thought he would have the sword."
Sets up the Reach by buying all the debts of the Lords of the Vale.
Clears way for invasion through the Vale by Braavos.
Iron Bank owns Westros and gets its due through him.
It's a matter of logistics.