FP in R and Leanpub royalties

Now that I am selling Functional Programming in R I will no longer get royalties on Leanpub, of course. Those royalties are what I’m using to pay for the fee for new books there, and while I do have the money on Paypal from there to pay for one more, it doesn’t look like I will be able to keep up with earning enough between books to pay for the next.

Help me at least reach the break-even point with Functional Programming before I have to pull it down! If you haven’t gotten it already, go to Leanpub. It will only get more expensive once Apress owns it.