Current tally. It's near unanimous, @durin, so you might as well go ahead and call the vote.
They would need to produce enough genetic material to produce glands for more than one Astartes. If they only produced enough for one each, regrowing a Chapter would be pretty much impossible given that implantation can fail and kill the implantee, trainees die during the training period for other reasons, not every second progenoid is recovered, etc. You'd very likely end up with less than one to one growth, meaning recovering a Chapter from heavy losses would be nearly impossible. Add onto that the fact that Chapters need to send a tithe of their gene-seed to the Mechanicus and you'd see the problem get worse.
Yet according to the fluff, that is exactly the case. Chapters are repeatedly mentioned to have taken heavy casualties that cause them to leave the front lines for decades if not centuries at a time to rebuild their numbers.
Everything I have seen about the progenoid glands say the same thing: you get 2 from every space marine, and you can only taker one of those out while he is still alive.
It really is that inefficient and risky a process.
Hell, I played Chapter Master, a game based on the fluff, as the Salamanders. They only had 20 glands in the bank, and a chapter population of 772 marines. I was looking at 8.5 years until I could train 20 neophytes up to scout status and during that time I was expected to keep a sector secure with no reinforcements barring any auxiliaries I could beg/borrow/steal from the other imperial factions.
But wait, I couldn't train 20 neophytes because I had to donate 5% of my stocked glands to Adeptus Mechanicus every year.
The game was turn-based and each turn is one month. So imagine being able to get a recruit 100 turns after you start the training period.
All I'm saying is, Space Marine chapters only seem to bounce back from major losses because the scope of 40k covers/jumps between centuries at a time.
TLDR: Space Marines are not really cost-efficient or time-efficient for the Imperial Trust
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