Generally an AOC is written to fill allowance races that wouldnt fill otherwise. You get some horses who have went through conditions that can enter if they are tagged, you get up and comers who are entered in the condition that dont have to be tagged because the are eligible for the allowanace part of the condtion.
If you are talking a NW1xaoc where a horse can be tagged, they are probably cheap and worth the most at that point. In that case you are hoping to get it claimed, or they are crippled, in which case you are hoping to get claimed
)