Don't worry that you don't care about keeping up with the political posturing. Neither do I. Frankly, if I turn my back to a TV debate, I wouldn't know which representative is talking at the moment. And since you can hardly go a day in Bulgaria without hearing about politics, you still get the cliffnotes of the whole situation. 
And vote buying has been around for some time, I think. I remember a story one of my professors told us once. Years ago, some foreign inspector came to observe the elections, see if there's anything irregular. When Bulgarians pointed out to him how voters were paid in jar lids, he saw nothing strange. He couldn't conceive of the idea that people considered them valuable and sold their votes for them. Jar lids.
So you can imagine how readily they'd take the 100-200-300 lv.