Prologue: For a Nail.
Titans Tower is ran on three things. Heroes, Friendship, and Money. The heroes and friendship are fairly easy to find, the last one...less so. Getting the rights to build on the abandoned land was incredibly easy for a new team of superheros. Politicians fall over themselves to be the one to push it through, Companies often donate to heroic individuals for a tax break.
However cash is very finite. Labor is a big savor in projects. It's amazing how much you save when superheros are involved. Most of the team has some heavy lifting power, and two of them have a very hightech know-how. Robin left his teammates mystified them with how he could finagle parts from various companies nearly at cost. (All of which have on close inspection, connection to Wane Enterprises.) Along with Cyborg and an in house production plant,they could fabricate pretty much everything they would need. That being said. Hero's don't technically make money. There are ways to get funds, sure but coupled with
The Budget was ran by Robin, Raven, and surprisingly Beast Boy, who had a surprising amount of knowledge at the funds end he had picked up from his previous team.
In one lifetime a thug down on his luck, had a terrible migraine the day of the heist. And he decided to buck up and go through with it. No one was injured however the T-Car had some rather hefty repair cost.
This time however he decided to instead go down the local pharmacy to get something for it, and talked up a pretty pharmacist. He called off his plans in favor of a lunch-date.(Things turned around for him, and he ended up having a meta-human daughter with a rather potent gift of prediction, She looked just like her mother.)The lack of a thief shooting up a car, gave leeway in the funds of one months budget, leeway that allowed for the purchase and maintenance of cheap monitoring equipment in a familiar cave...
[AN: I cannot believe in cannon Robin didn't set up any kind of equipment to monitor Terra.]