Any electoral system is subject to abuse. But would you really rather continue the sort of farce that went on in 2000 in Florida, Wisconsin (multiple voting), Missouri (leaving the polls open longer in the Democratic stronghold) etc., than try to put a lid on incompetent and bought voting? And it seems to me that taking away the vote of anyone--at a particular level of Government--who takes a regular payment from that level of Government--especially if unearned--is the least arbitrary restraint you could have.
William Flax Return Of The Gods Web Site
There will always be abuses. Many situations cannot be eradicated. But they can be made better - through vigilance rather than more laws.