I'm still number crunching, but for now harvesting enemy devices looks like it could be a real great way to advance your gear cheaply.
Especially teamwork checks and a special workplace will allow you to get a lot of packs out of cheap devices.
Personally, I won't stoop as low as dissembling 5¥ security tags in a special work area for potentially 1,25 packs worth 312,5¥, but larger loot is fair game

Edit:
So, how does modding fare with a new character?
Surprisingly well:
We start with a Transsys Avalon for 5000¥
Adding Sleaze and Attack at 1 for 24 parts or 4800¥
Persona Firmware and a Program Carrier with a Virtual Machine costs 2 parts and 980¥ for a total of 1380¥
Now we increase Sleaze and Attack by one each with 8 parts or 1600¥ (also reducing the damage monitor from 11 to 7)
Now we lower F and D to increase S for another 8 parts or 1600¥
And just for fun we add a data tap for 300¥ (what's the use of that Cable Tab Dongle for 500¥)
42 parts used= 8500¥
You now have a Modded Avalon with:
Rating 6, A2 S4 D5 F5, two slots and a capacity for 7 matrix damage (try to avoid that with your virtual machine)
Total cost: 5000+8500+980+300=
14.780¥ Woohoo. Hacking possible even for ressources E characters