For anyone interested, here's how the Masterworks pre-orders rank thus far for 2011:

Marvel Masterworks 155   MA Amazing Spider-Man Volume 13 1824 Mar-11
Marvel Masterworks 151   MA Uncanny X-Men Volume 7 1495 Jan-11
Marvel Masterworks 158   MA Mighty Thor Volume 10 1437 May-11
Marvel Masterworks 160   MA Iron Fist Volume 1 1413 Jun-11
Marvel Masterworks 161   GA Captain America Volume 5 1401 Jun-11
Marvel Masterworks 157   MA Doctor Strange Volume 5 1370 Apr-11
Marvel Masterworks 156   AE Strange Tales Volume 4 1321 Apr-11
Marvel Masterworks 154   GA Mystic Comics Volume 1 1301 Feb-11
Marvel Masterworks 153   MA Sub-Mariner Volume 4 1275 Feb-11
Marvel Masterworks 152   AE Battlefield Volume 1 1189 Feb-11
Marvel Masterworks 159   AE Jungle Adventure Volume 2 1169 Jun-11

In 2010, the average Masterwork sold 1490 copies, which was an 11 percent decline from the prevous year. Thus far in 2011 with 11 titles released, the average volume is selling 1381 copies, which is a 7 percent decline. Assuming the second half of the year can remain as strong, those are pretty good numbers considering the state of the economy.