Just remember when they have the camera hidden like that it's all about safety. I wish they spent the time and effort and catching actual poor drivers and especially ones that don't indicate, but that would involve actual work.
Yea I agree it's just an easy way to catch you/make money. There are so many things people do that are dangerous, not concentrate, don't leave breaking distance, have poor/bold tires, bad brakes, be pushy when driving etc, all much harder to prove but imo far more dangerous then doing 20mph over on a straight bit of dual carriageway.
I been driving over 10 years do a fair few miles a year also as I live in a rural area, I also have a motorcycle. I've never had an accident touch wood.
I do speed all the time but only when the conditions are right, so always tons on breaking distance, and never in built up areas where other cars/people are around.
I think the moral of the story is just never go to Wales.