We currently don't have a feature that offers a kind of "advance" on a Shelf spot or any other advertising features and other services we provide for Leanpub authors, sorry.
However, we do have a similar kind of "bootstrapped book" feature, where you can use your unpaid royalties to buy Shelf spots and other services.
Here is an article on this topic:
Finding the "Promote Your Book" Page for Your Leanpub Book
Every Leanpub book has a "Promote Your Book" page.
To get a Shelf spot for your book using unpaid royalties, go to the "Promote Your Book" page for your book here:
https://leanpub.com/YOUR_BOOK/edit_royalty_promotion
...making sure to replace YOUR_BOOK with your book's unique web address.
You can also find the "...." page on your book's "Overview" page:
On the Promote Your Book page, you'll see how much unpaid royalties you have available to get a Shelf spot etc.:
Related Article: Tips for Self-Publishing and Selling Books Using Leanpub
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