I dunno if anyone else saw the copy of TRO:3150 end for just under $400 today but I really hope things like that are a sign to CGL that POD efforts for any and all old books are worth doing and would be greatly appreciated by players. It keeps getting mentioned in updates as something being worked on, but we've yet to see any progress.
So, there has been some progress there--behind the scenes, anyway. Mark Hayden, who had previously done the paint-overs of the Mech renders on pilot cards and other work, has been getting trained up in layout by Ray and Dak. He's done some great work on the first two Force Manuals and accompanying PDFs, and we're excited to have him fully up to speed to expand our layout capabilities.
Because, that's the eternal bottleneck with POD. As I've said previously, even with the newer CGL books, we can't simply hand DTRPG/Lightning Source the PDF file and say, "POD this, plz." The books have to be worked through a bit of layout first. But we haven't been able to spare Dak--when I say "we" there, I mean not just BattleTech but CGL as a whole. His workload is constantly backed up and has to be carefully prioritized, and POD is never a high enough priority. I'm really hopeful that with Mark on board, that could change.
Because, for whatever it's worth, I bring up POD a lot internally. The back catalog, even just the CGL back catalog that's actually POD-able, is a huge potential source of revenue. Best I can say in the example you brought up is that TRO: Dark Age includes at least some of the Mechs from the long out-of-print TRO 3145 AND 3150, better than nothing.