I wouldn't get Inna's pants until you're seriously out of other things you could be upgrading. I'd recommend Lacuni's and Zunimassa's Trail (8% elemental damage is pretty huge.)
The really crappy ones do (go for 2-3 mil). Chances are though, getting jewelry pieces strong in 2 of the trifecta stats with bonus damage is probably at least five times cheaper than trifecta jewelry with the same damage increase.
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I think you're massively overestimating archon pricing, Jaetch. 140 mil seems overkill ... I started at around 110k dps with 20 mil of gear.
It's pretty amazing what you can get for 1 mil these days:
1000 dps 1h weapon with socket and lifesteal
50-150 damage triumvirate
150 int/150 vit/60 resist all chest armor
Also, you can make critical mass build work just fine with ~1 mil gold (you really like overshooting on price estimates, lol):
Screenshot of gear purchases is on the youtube description.
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I think you're massively overestimating archon pricing, Jaetch. 140 mil seems overkill ... I started at around 110k dps with 20 mil of gear.