Missing the point
SWB No one has suggested that spotters are master criminals, however the information they 'share' frequently gives accurate details of what aircraft are based where.
This information is readily accessible to anyone who wants to use it (Including criminals) therefore increasing certain machines being targeted.
Its a simple security situation; the more you 'advertise' what you have and where makes it very easy for someone to target the location.
The CAA do not publish information of this nature only the registration based details of owners or hirers, but very comprehensive info is available in publications and the net of 'actual' locations of machines. Time to start fitting discreet trackers on expensive equipment.