Yes matrix I agree, sophisticated was not the right word to use.
They go after the easy ones that they can close with little cost and win points for any funding or lobbying they may need.
Or they go after the headlines, busting kids like LeBed or that young fellow that lived near me in Burnaby, BC, accura2000nsx or whatever his handle was that was pumping stocks on "my" SI thread as well as others, and of course TMex who got lots of press, paid his pittance, then moved to the south of France and hangs out with the rich and famous now.
Even then the ones they "win" are usually just hand slaps, give us a token $20K and promise not to break that same rule again and off you go.