see the way i understood it, high OD forces players to fall into your trap because you're placing a high-skilled encounter on the map. low OD forces you into most everybody's encounters, but you will also be able to be easily skipped (also, ganked) via the dialogue box popup.
it feels like that is right. i play a low OD character and my pvp strategy involves falling into encounters all day, which happens very easily. hunting players with high OD will yield poor results, as will hunting with numbers. you will encounter similar groups if you hunt with high OD/lots of people. however, laying a 'trap' with a high OD character in the party will cause people to roll the dice on your encounter if they come across your square, likely in your favor.(i think!)
also, +1 to the part of jay's post where hes commenting on the carebears complaining they cant find anybody to gank with their deathsquad. that is the oh-so-sweet taste of mechanical justice. thank you game mechanics!