[Esther]

The general consensus seems to be that, if you total up the number of stats that are essential to your build, the number of APT points purchased before a new APT bonus in every stat is gained needs to be equal or less than that number.

For example: a build that needs 7 stats, will see a benefit even by spending 7 points for an APT increase. This is why 0-APT races with these spread-out builds tend to go for 43 (scaled 42) APT. Spending 7 pts in APT instead of in each of those stats, also nets you a free point in the stats that aren't 'essentials' but still have value.