Zelaron "disapproves" of more than four posts a day

It seems to me that the activity-meter is somewhat faulty in that it awards people for only posting a maximum of four posts per day. Thus in some way feeling... "Disapproves" of posting more than four posts per day, as it could be better "saving" those posts for tomorrow.

Is this just me or does this feel wrong in that it semi-awards steady, low-class activity but not bursts of inspiration/madness?

Would not a different system be better, also - why does this system even exist in the first place? Personally, I see no problems with the old: More posts = more ranks, high enough post-count = custom rank or similar "bonus".