It was a mid-level example to make it accessible to readers. Here's an extreme example:
Fighter10/Cavalier10, Str 26, doing full Power Attack on Unstoppable Charge, with +5 weapon and +5 misc bonuses (such as specialization, Prayer, or Inspire Courage):
Lance 1x: (1d8 +8 Str +20 PA +5 weapon +5 misc)*5 = 5d8+190
Glaive: (1d10 +12 Str +40 PA +5 weapon +5 misc)*4 = 4d10+248
Lance 1.5x: (1d8 +12 Str +40 PA +5 weapon +5 misc)*5 = 5d8+310
Now we're talking 120 pts. (Power attack+.5 Str bonus)*(charge multiplier) = 120.
The problem is that Spirited/Deadly/Unstoppable Charge each make the lance less marginally advantageous than other weapons (at the end, 25% advantage as opposed to the 100% advantage the lance starts out with). With no Spirited Charge, the lance will always be best even at 1x, because it gets 2xStr and 2xPA on a charge where a glaive gets 1.5xStr and 2xPA. (Assuming Str is at least +2 bonus, in order to balance out the base damage difference)