YouTube is down and now I'm literally having the worst day right now GG.
Re: Praetorians, at 10,000 IM per Praetorian, while they may cost x3 the amount of a Forge-grown servitor, their stats are actually very nice and unique for the Template, and I assume that it is easier to level up to 10-11 (which is when the last bit of benefits of their Template kicks in) with 10 having been the hard-cap for non-PCs and the baseline for a human paragon, which the Template essentially makes them into (or just being uniquely magical enough to qualify to break the Level 5-6 soft-cap).
So a veteran could quite likely be ECL 12-13, and with the ruling that associated class levels increase CR by 1 for each level, that means CR 12-13.
CR 13 costs 14,400 IM to produce in the Forge, compared to 10,000 IM for one Praetorian.
Now let's assume that there are 3-4 instances where the Praetorian who works their way to Veteran over a couple of decades of service on the front lines dies, but leaves a recoverable body and isn't soul-killed.
It breaks about even, TBH... it's just slower to show its value, but the maturity potential is there, especially in all matters of scale.
There of course some who you could call a wash, as they die and aren't recoverable for one reason or another, but that's a pretty acceptable risk factor.
Now, on the other hand, if you equip them with Construct armor it's a lot harder to justify the cost at lower levels, but at the higher end, a Hero Praetorian in Titan Armor for example would definitely be more than worth it, and veterans in Warlord Armor might also break even in value.
Not sure if you could justify the expense of equipping regular ECL 8 Praetorians with even the Warden armor though.