To get it out of the way before anyone asks: no, Space Dandy did not make the US charts. Threshold for the BD chart on its release week (March 2-8) was 7277 copies. That pegs it at considerably less in its first week than either Attack on Titan release. This may indicate that amazon rankings in the 5-digit territory (what the RE and Amazon editions had for most of their solicitation) are less valuable than October’s power law would suggest; that formula predicted splits of 732 (RE), 7500 (LE), and 1918 (AE) copies sold, for a total of 10,150 copies. If, say, being #10,000 only accounted for 10 copies being sold in a day, and #5000 only gave you ~20, that drops the non-LE editions from contributing about 2500 copies to contributing roughly 500. A total estimate of 8000 is still an overestimate, but not nearly as much of one. Of course, it’d be pretty dismal for the rest of the sales projections if that were true; it’s by no means a given a smaller-market Sentai release will make it out of 5-digit purgatory on release day.
The way to test this theory would be to monitor items with limited amazon stocks (typically the # of stock copies gets revealed when it’s under 20) on an hourly basis, tracking micro change in stocked copies versus rank over several days. I’ll probably get around to that eventually, but it seems like it’d be a real pain to do without automating the process. Tried that before to no avail.
Anyway, on to April. Couple of things that have a >1% chance of charting: Free s1, Freezing s2, the usual One Piece and Naruto volumes. The May 1 (Friday) release of Time of Eve is included in this dataset, given that the week it comes out in is the same as the one for the April 28 (Tuesday) releases. Data below was taken on March 30, 2015.