Arrrg, it's taking a lot of time to load the pages :/
If you mean using non-maxed weapons or efficient weapons, I'm about 80% sure of my following answer of yes and no
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In the old days (up to a year ago, when pham started whining), no. HA and efficiency of the weapon determined everything so you could get 120% of tt spent back on nearly every run with the right weapons/skills AND STILL have globals and hofs as bonuses. My guess is that the cash came from the poor folks who uses uneconomical weapons, or MA didn't do their multi-variable calculus right when doing the loot formulas
My guess as to why this changed is that the previous system was basically a pyramid scheme, with the older more experienced players steadily sucking away the money of newcomers. The problem is of course that they withdrew their enormous profits and that newcomers became disgusted and left.
Now, nearly everything is avatar based when it comes to loot size. The more you lose, the bigger you hof, and vice versa. I first tested this for a year and made a turnover of 100,000 peds with no globals over 200ped (I used my loot optimization systems vigorously = consistent returns with 85-90% of tt back = no hofs) ). Just recently, I started to intentionally lose peds like crazy, and got 5 500+ped hofs in as many days testing this (intentionally lose a lot of peds, use system to force out a hof, rinse and repeat, and still about 90% tt back).
Now, this does not mean that MA doesn't release some bonus loots from the % they take and auction fees and whatnot, but I've never been lucky enough to get one of those. Does more efficient guns like imk2 or HA matter then? I suspect they still do, and affects what % of tt spent you get back. I don't think ever gets as low as 75% for 0HA however, nor over 100% for imk2s, hence ubers whining now and then.
That been said, I've never gotten an imk2 to test return %s with my systems nor had enough guts to blow 100kped ammo with a 2HA weapon, so I'm not as certain as I'd like to be, which is good. The day I know everything is the day I sell out due to sheer boredom.
Cheers, and flame away ^^