I am curious: how many strange coins are currently in your possession. I always seem to find something to buy from Xur, even if it's just exotic shards, which keeps my coinage low. When reading this forum it would seem that people are drowning in strange coins.
Edit: Well... Looks like the Destiny community that frequents this forum is more than flush with coins to the point that they are near meaningless. The reason I chose 46 as the upper cut-off was that then you would have two weeks worth of Xur primary purchases in reserve. Anything beyond that and it doesn't matter whether you have 100 or 1000 in terms of being prepared for buying Xur's exotics as long as you keep it at that level. Thanks for answering the poll.