Well why not finding a compromise??
One item per week with somebody from ur friend list and a blockade for recently added buddies.
The item can be anything and so people would choose wisely!!!
Think about it...
Edit: let xur do the trade for strange coins and nobody can complain that the other trade partner didn't deliver.
He (xur) has ur friends list available every Friday(-Saturday-Sunday). The list tells u with whom u cannot trade yet; otherwise u choose ur item; ur partner goes to xur chooses an item and both players confirm the trade for 28 strange coins. Why 28? U earn 27 every week on a lv30 weekly (with 3 chars) that balances the whole idea... People have to consider trading or buying.
PS: sorry for the grammar - english is not my first language... Lol; but I think the idea is clear.
English
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Exactly.. All ideas are something worth considering..