Mind the Gap--veinglory

As the data stands Ellora's Cave is well clear of the pack. This is most obvious in the graph of numbers sold in the first month. However my EC data set is small and recent. If we take the publishers figure of 850-900 the gap may be a little smaller, but then maybe sales are a little lower in the holiday month of December when budgets are tight. 1100 may actually be more representative of the whole year.
In any case, even in this small data set, there is evidence of an upward trend with some of the other presses and several of them have recent titles selling in the 800+ range. I think the gap might close with a few of the 'rest of the pack' gravitating upwards to EC sales level over the course of the next year or so. If I had to guess I would predict Samhain (moving up rapidly) and Loose Id (an older press, improving steadily) would be in the following group ready to move up into the major leagues. But then I obviously favor these presses having published with both multiple times. I suspect others are also well-placed to increase their per-title sales? Thoughts?