I don't think it ate up any more resources than, say, MySQL support. Fog Creek employees have produced tons of innovation since Wasabi was introduced, including brand-new companies like Trello (2011/2014) and Stack Overflow (2008), as well as in-house products like Kiln (2008), WebPutty (2011), and Make Better Software: The Training Series (2009-ish). None of these projects were particularly resource-constrained by having to do some compiler and runtime maintenance in the process of building FogBugz.