Yeah they print them up to look like money just so people will pick them up and then read them. Probably because they know that otherwise nobody would read their crappy religious tracts. Apparently some idiot Christians think it's OK to leave these as a tip because, "God's love is better than money! Derp!" Sure, try paying your rent with God's love.
Christian apologetics is the art of rolling a dog turd in sugar and selling it as a donut.