How to get supplement club membership.

What have the sites in common, which got dropped by BD?

[AcsCh]

Some attempts where made to number the reasons why sites might have joined the "sup results club". Would it here be possible just to line out everything you think might have influenced this? (Would be nice to have this thread clean about "supposed influence factors", no discussion about). Might be, that this way we get common points, to understand what's or at least to whom it happened.
Even if this is a glitch, it might indicate some future "improvements" in the algo, which was released maybe a bit too early...

Here our list.

1) Sites affected are white hat, BUT SEO done (heavy theme based anchor text interlinking "you might be interested too in:")
2) Sites have PR 5+
3) Seen (heavy) improvements in BD (before dropping ;) )
4) Site is multilingual! (MC mentioned about tracking down international spam!)
5) Site is using sub domains quite heavily. www is still up, but all non www are dropped.
6) Site is hosted in Europe
7) Site can be considered authoritative, leader in our niche
8) subdomain1.ourdomain.com is an exact copy of www.subdomain1.com, www.subdomain1.com was NOT dropped, but subdomain2.ourdomain.com to subdomain100.ourdomain.com is dropped. All sub domains have unique content!
9) Site is template based
10) Site is about products (80% of pages), where only short descriptions vary (Feature lists are very similar on every product page)
11) Site is in 8 languages. Where translation still has not been made, the English text shows, means plenty of duplicate pages with exactly the same content.
12) Site "had" 250'000 pages indexed. Now 44'000 in supplemental
13) "Good" pages are dropped, NOT MOVED to supplemental.
14) Site up since 3 years
15) Site (had ;) ) privacy protected registry put on recently.
16) Was recently included in Google Sitemaps (now paranoid dropped ;) )
17) NO sitemap was submitted, just included/verified in sitemaps
18) Is using adwords
19) Is using adsense on some subdomains
20) Inexplicable steady rise of visitors (up to duplication) about 2 weeks before drop (without! duplication of page views or KB transferred)
21) robots.txt uploaded 2 weeks prior to dropping! (No robots.txt before)
22) googlebot still visits pages which do not exist in the index. (quite heavily even)
23) PR prediction is "unknown". (checked on iwebtools)

Well, thats all we can come up for now. But maybe google just accidently formatted the HD, where our (good) pages where on, and can't find the backup, as heavy spidering was reported... hihihi..

Please continue/match.