The team has sold out every game it has played at UofP; preseason, reg season, and post season.
You're probably right
But if as you mentioned earlier, he is not at 100%, this is not a "genuine" chance. As Jason Whitlock eloquently put it, "Peyton Manning has been medically cleared to collect a $28 million bonus on March 8th." With the medical clearance came the caveat about his limited arm strength. You cannot assume that he will play at an elite level given his age, the # of operations on his neck, and lingering affects from said operations. In addition to which, Manning was cleared by his doctors; not any team's doctors. This medical clearance was to be expected, but still leaves much ambiguity surrounding the situation.
The Cards should certainly look into signing Manning, but the team needs to be smart in its pursuit. First, Manning has to be at or very close to 100%. Second, how long can he realistically play for? One thing's for sure, he is not the long-term answer, but rather, another patch of duct tape on the leaky pipe that is historical QB futility on this team. If he can play and produce for 3 or more seasons, then it might be worth the risk. Third, the team cannot cut Kolb until Manning is signed. If for some reason the team cuts Kolb and Manning signs elsewhere, the team now has depth issues at QB.