I thought this had been confirmed. If I remember correctly from a few old-timey discussions with Marco, all ammo spent (on ranged weapons) goes to the loot pool, and weapon decay is MA/FPC profit. I don't have time to search for it now, but I thought it was in one of those Q&A chats they used to have every now and then in 2006.
Unfortunately this isnt true, as it would make high decaying guns and amps horribly uneco if your spent 50% on ammo and 50% on decay compared to 90% on ammo 10% decay, but this isnt the case.
MA gives everyone
longterm a certain % back, varying with your eco, but only on ammo/gun/amp decay, fap and armour isnt in the equation.
I think that at the moment with a 3.0 Average eco you'll get 100% TT return on TT spent, of course if everyone started using more eco guns, then the average would go down.
The MISS's are just alot more noticeable as you get them pop up in chat, but as many have tested, we have 2% more misses, instead of 92% hits landing and 8% miss, its now 90% and 10%.
2% could add up to alot in the long run, but what that does is reduce eco on all guns, therefore increasing the loot per average eco return %.
For example:
If everyone used guns with 2.5 avg eco, then someone using a gun with 3.0+ eco would profit TT wise, but if everyones eco dropped to 2.0, and the person with 3.0 dropped to 2.5, he would get the same results (TT profit) he did with 3.0 when everyone was using 2.5.
1) Average Eco: 2.5 = 90% return
Person using 3.0 = 110% return
2) Average Eco: 2.0 = 90% return
Person using 2.5 = 110% return
It's not exactly a crackpot theory, as back then when no (L) guns existed, the average eco was surely under 2.5, yet people had the normal 90-95% overall returns, and everyone with 50+ hit and an imp/mod gun profited.
The system has a way of balancing itself for the most part.