Until someone shows me that the two-a-day worlds are emptier (Tark specifically) than the one-a-day worlds, I don't buy your argument.
Now if you CAN show me that Tark is emptier than all the one-a-day worlds, I'll leave with my tail between my legs and head bowed in shame.
And the apples and oranges (or different kind of apples) argument is ridiculous. It's the same HD as any other world. Same rules, same divisions, same recruiting, everything. There is no difference, regardless of whether anyone thinks so or not.