Thanks all for the feedback, much appreciated!
We're familiar with the challenges. Some are easier to solve (dealing with illegal stuff being requested), others are a lot harder (making sure that there are enough people willing to bring something). For the moment, we want to see whether this app would be useful to people. No point in burning cash on something nobody wants .
I was just in Peru. A really nice woman I met at the hotel bar asked me to take a big bag of baking powder to her dying grannie in HK. Do you think I may be in trouble?