Thus no difference on sib/nonsib outside learning period
I am not sure what you mean by this. The learning period for SIB is finite, however not so for non-sib. Point in fact I happen to see a player (I believe it Mercury) in a video and showed 13.5/10 on his mod-merc in damage. Now this was a few VUs ago and may have changed. I not sure if this has anything to do with what you are saying. BTW this is not a dig on you just not sure what you mean.
As to a lot of the other comments:
1. I also think that the amount of weapon damage and mob size has something to do with it.
2. I am not sure about decay of weapons, armor or healing.
3. I was not really asking about TT value to skill gain as for this question I chose to ignore that part.
4. I know other will debate number 3 but I am not really sure that would make a big diff to me.
5. Worry about getting your money's worth in this game is in the fun of the play, IMO, not the income that maybe made.
6. I think, at best, it is little better than a crap shoot or slot machine.
7. The little better is I think you have a better chance because of mob hunted, amount of time in the game, skills and maybe other things we are un-aware of. Biggest is being in the right place at the right time
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Just one last thing. I know that I did much, much better during LT migration both ped-wise and skill-wise the Halloween MM. The MM mobs were bigger and gave much less average loot, for me, than LTs. Moreover the number of globals per capita was way less. I did about 37 hours in MM level 3 and some level 4 and around 80 globals and one HOF (800 ped). LTs I did play more time but had near 1K globals and 3 HOF ( all 3 about 1800 ped each). All my equipment was the same. I really though I would do as good or better because of the mob size but was very disappointed. Anyway just a side note.
Thanks all for the comments and hope I didn't offend anyone.