Also likely repeating things here that I have said elsewhere but, here it goes.
I rarely recall so many characters being involved in this particular chyen loop. Mostly just the one who took an item and the immy who sells it. From what I have seen, most players/characters try to reduce how many are involved as it means more money for them if they do.
Also, once a new player learns how the whole OOC NPC earning cap works, they realize that being the one selling these things for others tends to be a very inefficient use of that cap. Some are willing to accept that for the interaction and other non-monetary benefits. Some not so much.
I think that this source of chyen has been replaced by other new sources of chyen. I can think of two that have made some PCs VERY financially successful. I don't think there's a massive lack of chyen in the mix compared to times past. I think it's coming from different sources.
Also, I think that if it is desired for gangers to have more chyen, they can be given more chyen. There are or were systems in place to provide gangers with regular flash and guidelines on making sure they had a reasonable amount given their situation. These can be adjusted for sure.
I actually think the current chyen flow, as I have seen it, encourages gangers to go out and do more gangish things. Like trying to mug, steal and extort. Insert themselves into the chyen flow.
Further, I think that the lack of chyen in the mix has as much to do with outside sources, places you might say are above or outside the gangs, possibly failing to funnel chyen to other PCs. Hiring the mixers as it were. I think it's about more than this one chyen source changing.
Honorable mention, I think you can still engage in this means of earning flash. It just takes more effort. More steps are involved. I won't deny that the flow rate is reduced by the changes though.
Lastly, I think that gangers don't NEED all that much flash. Rent, clones, possible DCD and some basic weapons. There are a lot of protections in place so even Clones/DCD might not be a huge expense for most gangers.
I will say that I have reservations as to how the whole mix is organized and am not a huge fan of how gangs operate from an OOC systems perspective but they are what they are and this feedback is with that in mind.