vb.org actually in fact did just upgrade, they ran 3.6.x for the longest time and a couple weeks ago updated to 3.8.10, they stay with vb3 because it's the best (duh).
upgrading plugins... that is not the reason... they had to upgrade all sorts of plugins just to do the upgrade they just did. But I guess you'd have to hear that from an admin.
But IMO they stick with vb3 because its not bloated how vb4+ is, it's simple, its perfect. Regarding your spam issue install the plugin I linked to in your other thread, I was having the same issue, that product will block almost all spam =)
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