Mass-mailing of CVs of job market candidates

Send my CV to Mark. One reason for this is to mass-mail CVs of all job market candidates at LSE this year to many academic departments (which is "a standard practice amongst many of the top US schools" as Mark puts it). But Cawley (2006, p.19) writes:

Likewise, your department's mailing of CVs is not a substitute for a job packet mailing. Stock et al. (2000) found that only about half of hiring departments even review the packets of CVs, and only about 20% reported scheduling an interview on the basis of the CV packet.