He has already sold the icebreaker twice before. Just like any of Xur's weaponry it is extremely popular for a weekend or a week. But over time people just go back to what they are comfortable with or the next Xur special. I'm happy for those that can get it now, I can focus on learning other parts of the fights that normally have the people with icebreaker sitting back sniping. If there was no icebreaker this weekend, there would be posts of people breaking discs cause they didn't get one. People will complain regardless.