A more precise way of measuring sales was put forth by Ebscer, the developer behind free PlayBook game Pixelated. Using the number of free downloads of Pixelated, Ebscer extrapolated the figure to estimate that 429,000 units of the BlackBerry PlayBook were sold as of the June 15th date of Ebscar's post. Although the game developer admits that some of this figure is based on assumptions and guess work, considering that Pixelated is one of the top ten most popular downloads on RIM's tablet, Ebscer says that he has more accurate data to work with than most when making an estimate of PlayBook sales.
While we have to be clear that this is just another estimate, it might be a more realistic way of coming up with a figure. If the BlackBerry PlayBook did sell 429,000 units up to June 15th, it would just be another number coming in slightly under expectations for RIM which has been what life has been all about recently for the BlackBerry manufacturer.
source: Ebscer via BlackBerryCool