Yeah, there are a lot of people who will kill for $80,000, but I don't think they can pull off a masterful plot to get themselves wrongfully convicted and then have the DNA to clear their case.
Evidence is hard to get rid of, such as footprints, finger prints, saliva, hair etc. Even a thief in the type of crimes you mentioned would leave some type of evidence that would be discovered and examined.
But hey what do I know? I watch too much CSI, though so far I haven't seen any with Larry Fishburne.
Everything you assume is violent crime.
There’s lots of other crime where DNA plays no role. Foot prints play no roll. Saliva plays no roll. Hair plays no roll.
Any number of white collar crimes use non of the above.
Most crimes get little police attention when it comes to detailed scientific evidence. That takes time and money of which they are unwilling to spend much of on your loss. See how much evidence the police take if your house gets robbed. It isn’t a CSI world.