As Rick says - I often use a security guy to watch my vehicle and gear when kiting at the main beach in Port Moresby. But he is also employed by my company and lives downstairs at my place, so it is not a big deal, especially as he is paid about $200 a month.
He also comes to the beach with me on the weekend and looks after my kids while I (and my wife) are kiting! - but now I am just showing off.

Frankly I would be much more worried about losing stuff in WA given the stories I am hearing. Most PNG people are so stoked to see you kite at their beach they don't even think of taking anything - and wouldn't generally anyway. 99% of them would stop a thief from breaking into your vehicle and if there is enough of a crowd they will beat the living ** out of him before handing him over the police to finish him off.