So, ultimately this comes down to personal experience. But I find that there is a lack of mugging on player parts happening in the last year or maybe more .
The mix feels soft. And there are non-combatants and immy's even running around carrying valuable tools, in valuable clothes, that they cannot defend themselves. And yet I have not seen nor heard of anyone getting mugged over this in around a year+. This is a contrast to how it was even 3 years ago. Where if you made unthemely choices like this(And yes it runs counter to the mix's theme to walk around in silks and other high quality clothing, carrying high caliber technical devices like quickterms and liteterms like a corporate employee), you would have players roll your face in the concrete and steal your shit. Generally leaving you naked in an alleyway if you were lucky.
So on from that... As a bit of a tax to being unthemely, I'm going to propose a system, that on the outset I think would do some good.
This system is as such.
Walk past a ganger openly wearing high quality items, you get an auto aim action fire off from the NPC on a chance based basis. I'd say maybe scale it based on the items value, from about 2% if it's worth more than 2000 base value(2000 is literally more than a weeks income for most people in the mix.) to 50% if something is worth more than 30k. An exclusion list might have to be built, for things like Xo3, or Xo5, Solo gear and kit. But for everything else, it should roll on if that ganger feels like messing with you.
After the aim stops you, the Ganger says to you, "Give me (ITEM) or I take it from your twitching body." You're being mugged. Wait too long, I'd say 1 to 2 minutes and the ganger starts swinging with all the usual effects.
You have choices and chances there to escape, many in fact, you also have choices to even fight off the mugger, and if you're in good with a certain gang, maybe they won't bother you about your fancy shit. That's up to the coders. But the other ones will. It's not someone swinging on your ass randomly. It's something that is projected, avoidable using the typical ways of blending in. And it will add additional complication to existing within the mix that feels themely.
This item stays on the ganger for a bit, maybe a week at most, giving you an opportunity to hire a tough to smack the ganger around and get your item back, or to hire a dip to retrieve it for you covertly, and after this, the item, whatever it may be, goes into the markets.
Stimulating the economy.