This is super interesting. I noticed absolutely none of this when I went. Everything was orderly and I don't recall any major instances of bad behavior. If anything, I had two of the most offensive situations at Hong Kong Disneyland.
I have a theory on why this is happening in a greater abundance recently. When I went, Shanghai Disneyland had just barely started offering seasonal passes. Before season passes, entering Shanghai Disneyland to sell 2 dollar bows would have been ridiculous. You'd have to sell more than 25 per day just to break even on admission, and that doesn't factor in transportation or cost of the goods.
A season pass comes out and the whole equation changes. A weekday pass starts at $120. Selling FastPass redemptions and peddling goods becomes much more reasonable. You now have to sell only 60 bows to break even on a ticket that can access the park for months.
You can also use that same ticket to add additional revenue by reserving Fast Passes and selling those. Imagine your livelihood revolving around mastery of the FastPass system.
I personally think this abuse of the system should not be tolerated and unfairly impacts the experience of everyone else. With that said, you have to appreciate the brilliance of their strategies. I imagine this will be a problem that Shanghai Disneyland will continue to contend with for years to come.
Disney is just going to have to learn how to outsmart them. I wish them luck!
Edit:
@Buried20KLeague, yeah it's not on the official site. I actually realized me and my traveling companion could have saved a little money had we bought these:
http://www.themeparkinsider.com/flume/201610/5314/