Right, first of all - OP posted that his stuff doesn't sell / won't sell for much MU, while simultaneously complaining that (L) SIB are 115%+. He literally posted "Supply & Demand - The Post", but we don't know anything about economy so we should shut the fuck up.
Secondly, the economy is not "bad". It is just different. "Too many UL stuff" isn't a good argument - we complained for ages that all we looted was materials (10X%) and nothing fun. So MA adapted to the complaints, and now we can loot upgrade parts & items again. You hunt robots, you can loot GNC (270%, 13.5ea), HA01 (8000%, 80ea), HA02 (7000%, 70ea), Gen Fuses (5000%, 50ea). You can loot ESIs from high HP mobs (900%). You can loot shrooms from Marcimex and Caperon (50ea). You can loot items again (MF Chips, Guns, Armour). (L) guns thanks to Migration are rocking 110-130%.
Yes 99.99% of your TT loot will be nearly TT. There is massive oversupply. But back in the day, we looted fucking peds and pecs. You don't get markup on peds and pecs. 100.0000000% - and these were 99.99% of your loot.
MA literally gave everyone a gift with shrapnel - 101% guaranteed (or 100.7% if you're a melee-r).
Having said all this, yes I think Explosives crafting has killed the MU in Mining. But lets be honest, that was artificial MU. No-one was buying ore at >115% because they were crafting useful items, it was just amp crafting or high-tt attachment crafting.
Those who can, profit. Those who can't, whine.