why post correspondence by post?

An increasing number of companies have set up small shareholder sale facilities for holders or unmarketable parcels of shares (<$500). While their share registries permit shareholders to specify communication preferences including having all correspondence sent by email, the companies still keep posting announcements, notice of meetings, etc. What is the point of asking shareholders to specify their communication preferences if they are going to mail out announcements anyways?

GGE is one of them. Have just set up a small shareholder facility and with my trading and consolidation, have a minimum parcel now. Want to retain it for sentimental reasons but don't want to cost the company unnecessarily if they need to keep posting me stuff which I throw in the rubbish bin anyway.