There are hundreds of airspace infringements each year, when you look at the GA occurrence reports. But less than half a dozen prosecutions.
If you are talking to an ATSU then that will likely stop it going any further (providing it is only minor).
The ones that seem to be prosecuted are when the pilot isn't talking to anyone, cuts right through the approach or take-off paths causing massive inconvenience and tries to cover it up by turning off the transponder.