"The per-vote subsidy was less costly (to tax payers) and more "democratic" as it reflected voters in terms of maintaining political parties via tax dollars..."
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It was icing on the cake NTA.  No matter what a political party goes for the most votes it can get..  oh and as an added bonus they got extra money based on that as well.. plus on top of it all.. you could still donate, still get a tax write off and holy cow.. the party gets another tax credit based on the money you gave them if they spend it. NICE. Tax break on top of tax break on top of tax break... 

while the tax payer.. pays taxes, gets taxed on whats left over if they spend it, and admin fees out the wazzoo.