I'm working with tumblr for a while, especially with NSFW blogs. Had some better earnings with plugrush before. Earlier the CPM with plugrush was above $4, but now it's around $1.5-$2.5 which is worthless. Tried crakrevenue but the conversion ratio is very poor(1:4600). How about you guys, do you still make decent amount of money with plugrush? Please share your ideas of how to monetize both SFW and NSFW traffic?