This is a great idea, I'm loving all of these efforts to help post visibility :)
Low cost promo wont get you to the unfiltered front page, however it can get you visibility on lots of the category pages like /promoted/fiction , and I make an effort to support new user micropromotions I see go past on steemviz .
I've been trying to do a heap myself when I see undervalued quality content in categories where nobody else is promoting yet.. Sometimes you can get a post visible in 5 different categories for a tenth of a cent - feels like a pretty good deal to me :)