How i find good WPMU Websites with scrapebox

Hello, with wich code i can found with scrapebox good working wpmu sites?

i have testet with this
- cutsom footprints
- allinurl:wpmu*/wp-signup.php
- 10000 keywords

but the result was not good.

Find attached a csv file with 1400+ WPMU working sites taken from LinkFarm Evolution

hxxp://www.mediafire.com/?x000u6ux35v2vlw


File name: lfehostlist.csv
Submission date: 2011-11-21 11:52:38 (UTC)
Current status: finished
Result: 0/ 42 (0.0%)

hxxp://www.virustotal.com/file-scan/report.html?id=b14a124cdac75bd700d86b6a28d70e125888c900f32856a8731068ece2d07146-1321876358

hello scrapeboxers, thanks for the list, the list i have downloadet for a few days you have postet this on another tread, but only 2-3 blogs are created. i pay for a list how workes more than 100.

sorry noobish question.. what is so important about WPMU wordpresss sites?