Some reasons for empty units
Empty Units DO NOT necessarily mean units are available. Why, you might ask? There are many "kinds" or "types" of inventory in the system. For example: Developer inventory that has not been sold (not normally made available to SVN owners), owned inventory that maintenance fees are not current on (not necessarily available for usage), owners who have converted their staroptions to starpoints (this inventory becomes tied to SPG, not necessarily SVN), as well as the complex situation that occurs when owners deposit with I.I., who really knows what happens with that inventory (at WSJ in particular, I'm sure very little of the deposited inventory goes unused, but it certainly can happen due to late deposits, exchange cancellations, etc.....