What SP level do you need for your votes to make a difference?
I see the same 1-3 ct effect you mention and I just can't imagine the value in that.
I have some reservation against 'buying' power. Doesn't seem to be much different than in the 'real world' where money makes money. Part of what makes steem special in my view is the fact that everyone can make a difference but apparently you have to buy your way into power...