I remember when I started to collect different versions of CoB albums. I only had the original SW, copied HB and original FtR digi at the moment. Then I bought original SW and the newer Spinefarm release of SW. Then to hunt down the singles and so on and so on. Now I have like 10 or 11 different versions of SW, 6 or 7 different HB's, 7 different TW's, 6 or 7 different FtR's, 3 different HCD's, a couple of copies of each of the singles (plus the 7" versions of Hate Me! and Needled of course) and so on. And I'm still not even close to having all the different versions.
Purely insane, as you said, but I can't help it.
p.s. I'm not sure about those numbers of diff. versions, I may have less or more of each album.. I really should sometime make a thorough check of all the stuff I have..