Shares of RE/MAX (RMAX -0.39%) are up more than 20% on the day of its IPO as the rest of the market sags. Motley Fool Supernova Analyst Matthew Argersinger isn't surprised by RE/MAX's timing, though -- he thinks this is the right time for RE/MAX to IPO considering the success of its competitors, including Trulia and Zillow, which have had great runs since their IPOs. Matt thinks that the strength of residential real estate combined with low interest rates has made this a strong market for RE/MAX, but he worries about the market's future.