You've touched on another pet peeve:

A figure written as 1000s should not be read as "thousands". "1000" is "ONE thousand", not "thousand", so "1000s" would be "one thousands", which is clearly nonsense.

Unless, of course, you mean a bunch of figures like 1000, 1000, 1000, 1000, in which case there are four 1000s.

Dave Oesterreich