Why not have two categories of log entry -- those with the "me with my GPS" picture and those without? Call them "Proofpic" and "no proofpic" logs.
That way those of us who just want to visit sites and write about them without having to bother with taking and uploading pictures have a way to do that. This would give Waymarking site developers a way to restrict Waymarking game scores (how many waymarks has a person visited, how many people have visited a particular waymark) to the "proofpic" entries. Waymark owners would probably want a button to click to validate log entry type.
On geocaching, most of the interesting logs that indicate whether I want to hunt for a particular cache don't have a proof pic. The bogus ones are easy to skim past.
I just deleted two log entries to a couple of waymarks I visited the other day because I just noticed the requirement for proof pics. That sure dampened the fun.