Did Kendall and Kylie's book bomb?

Yikes- it looks like fans aren't interested in keeping up with the Jenners in bookstores. Their sci-fi novel Rebels: City of Indra has sold under 20,000 copies since it's June release. In comparison, Allegiant, the third book in Veronica Roth's Divergent series, sold an estimated 760,000 copies in the same time frame. The news has to hurt Kendall and Kylie, who were so pumped about Rebels when we met up with them at a book signing. "We came up with this idea that we thought would be fun," they gushed exclusively to us. Ouch!