not sure how big/low is that threshold, but I think I won't bother doing the trading cards anymore, until I'm sure they'll drop 
You can add location information to your Tweets, such as your city or precise location, from the web and via third-party applications. You always have the option to delete your Tweet location history. Learn more
not sure how big/low is that threshold, but I think I won't bother doing the trading cards anymore, until I'm sure they'll drop 