After reinstalling the game and re-reading this thread, I was reminded to comment on something else.
Here's a handy glitch...
After unlocking the map on the first island and then are told to capture the main... Don't...
You can throw all your minons into the world, pilfer millions and billions of dollars and still not be attacked due to the fact you have no real defence yet so the game don't send agents, though of course after you do, prepare to have agents gallor pour through your doors....
This is pretty much a terrible idea. It seems great, at first, except for one thing. You're notoriety rating. The rating is actually a bigger predictor of the agent types that show up on your island than heat. It's ALSO the meter that controls the introduction of Super Agents.
So sure, it seems great milking the world for all it's cash, but you get more than just higher level agents storming the island once you advance the storyline. You get multiple super agents arriving at once at a time when you're far from being able to remove them. It's a pain in the ass, and I ruined my first game trying to be clever. I really wouldn't recommend using this "glitch". It's never going to be worth it, since a) you have to abandon the first island and b) there is a cap on how much cash you can take with you to the second island. The only thing using this method does, is in the long run, is saddle you with all the Super Agent active while you're trying to build the 2nd base.
The optimal strategy is to keep your notoriety to the absolute minimum until you reach the second island. That buys you oodles more time, and money, to build up before your notoriety peaks and Jet Chan arrives on the scene.