Might help to have an explanation of what LR and BTS are. If only in the In-App purchase screen, instead of "A Donation will be made to LR" perhaps "A Donation will be made to Light Relief. More info at http:.//..." and link out to the site. Also, Google has now rebranded Android Market as Google Play.
Why can´t I bought fullversion on play.google.com? I have problem to bought aRFR on my Android because it takes to long time for the transaction.