Well, considering how much sky there is out there, as well as how many NEO's out there they detect on a regular basis (Near Earth Objects), that amount of money is just a drop in the bucket. At least 95 percent of the space around us is going to remain undetected.
/——/ I wonder if we don’t already have to technology to deflect an asteroid
Not a chance. Something between the size of a school bus to something around 1/2 mile wide, traveling at over 28,000 mph? Yeah.............sure.............the only thing we MIGHT be able to do is track it, but we don't have any kind of missiles that would stop it, they wouldn't be fast enough.
And, forget trying to catch it in space............those speeds are more like 50,000 mph.