It’d be interesting to see some sales statistics including commission information (how much of the money went to the distributor and how much to the developer) for games distributed on portal sites (such as RealArcade).
Unfortunately portals use contracts that doesn’t allow developers to publish sales numbers for them. I previously mentioned a typical fee for portals is somewhere around 50-65% off net sales, and as they don’t disclose their numbers, it’s almost impossible for us to get numbers sold.
Big Fish Games announced in their press release that their Mystic Inn game sold more than 2000 copies in the first three days. Mystic Inn is not their most downloaded game, but this information can give you some kind of clue on how much these games sell.