If a lane is oiled 30 feet and buffed to 35 feet, one can expect the breakpoint to be somewhere in the range just past there. The ball will not start to hook as soon as it hits dry. Also, those bowlers with higher ball speeds and less aggressive equipment will see a breakpoint further down the lane because their styles are not as lane-condition sensitive. The new Brunswick Anvilane synthetic lanes have 4 markers way down the lane that bowlers can use as either a target to see what they want to hit, or as a reference point to see what they did hit. Those markers coincide with the second and third arrows on each side.
People use breakpoint reference for a few reasons.
When the heads are drier, looking further down the lane helps the ball clear the heads a bit better. Sometimes the backends are a pit spotty. Looking at a breakpoint can help a bowler be accurate in the backend, where accuracy matters in those cases. There are other reasons of course. Bowlers are very improvisational and come up with new ideas by the game.