Because big numbers are harder to quickly parse than small numbers. Here, have 87209 equipment vs. here have 2946 equipment. It's much easier to read 4 numbers in a row and recognize it as a set in the 'thousands' than it is to read 5/6 numbers in a row and try to parse them out. It's called
Subitizing and generally humans have an exponentially harder time counting visual items beyond 4. Try placing a random number of objects, around 10, scattered around your desk. Now try to quickly figure out how many there are. How did you do it? The vast majority of people have to split them up into 2s, 3s, or 4s, and then mentally add them together quickly. So whenever you can avoid visually displaying more than 4 or 5 "things" that someone will need to count, you should. That's just good interface design
At least, that's my guess as to why they did it. You want all these numbers to be parsable at a glance. Even if someone has to take 500 miliseconds to parse a number, it slows the game down and makes it less fun.