They should be (and are) less - you need to be looking at ASICMINER in terms of their hashing power when comparing.  1 MH/S of ASICMINER shares pays a LOT more than 1 TAT.VM share (as it also gets incoem from sales of hardware).  It also COSTS a lot more - so no point directly comparing them as it's apples and oranges.

If ASICMINER sells a bunch of hardware and pays a massive dividend, TAT.VM won't get a bigger dividend.  If ASICMINER holds back most (or all) of a week's dividend to pay for development costs TAT.VM won't get a reduced dividend.  TAT.VM will get paid what its contract defines - and the ASICMINER shares are the visible proof that those commitments can be met.