One can't escape archaeological theory, although the status of theory in archaeology can greatly vary depending on where students and professionals train, study, and work. Depending on the educational path that led you to the archaeology, art and/or history of the Aegean basin you either had or did not have formal inculcation in archaeological theory. Few North American graduate programs in Classics/Classical Archaeology or ancient Art History included any form of theory as an essential component of instruction. In the UK, with its departments of Archaeology, mostly separate from those of Classics, this would not have been the case. For a holder of an North American advanced degree, theory was then something you acquired on your own (especially if you had anthropological proclivities) or not at all.
The CIG's collection of theory related books has been steadily growing through purchases and donations.