It happens all the time
Alot of GA pilots write total BS in the IF column.
1.5 hr flight with 1.5 IF -WOW! he taxied in IF.
Hours of IF on sunny cloudless days.
All night is also all IF in the dry!!
IF in VFR only AC hmmmmm!
Some of these guys don't actually know when to log IF but most know it's just pure BS (Unauditable).
Personally I would be suspicious of any logbook with more than about 25 % IF to IFR for GA in Northern Australia - there just isn't that much cloud and/or low viz. I have about 700 hrs IFR (over two NT wet seasons) and 79 hrs IF genuine (11%).
If anyone up North has really flown a higher proprtion of IF I would be interested to hear how. (At southern lattitudes it may be a completely different story I know)