The IBBs aren't generally worth it beyond the provided challenge in and of itself, anyway. Usually, by the time you can get a certain mod-ship, I have a fleet that surpasses the enemys, making the mod-ship somewhat obsolete. To top it off, you're not even getting what the enemy is using, since their loadouts are well beyond the OP limits, and you have to pay to restore them, too.
But the issue with Vayras sector, as I've mentioned, is that once I got a damn atlas with 0 storage capacity, 0 fuel capacity, 0 crew capacity, whilst retaining its skeleton crew requirement (which is quite dumb, how's a ship supposed to require skeleton crew whilst having 0 crew capacity?); The other time there was a Prometheus with 0 fuel capacity. This would not be an issue if restoring a ship was cheaper than buying a new hull of the same type, because then it would still make ships like these worthy of getting from an economic perspective. As that is not the case, these ships are quite literally garbage not worth recovering.
One problem with all the extra D-mods is interaction with IBB. IBB ships that failed to roll normally get added to salvage with all D-mods. With Vayra's Sector this means ridiculously long list and untenable restore cost (since it scales with D-mod count).