Pierce is not passing on $20 million guaranteed this year. But I do think the Clippers are an interesting match for him, if he would like to be traded.
You're probably incorrect here. Pierce has similar or greater value than Ginobili who just got a 3 year, 40 million dollar contract. The new CBA is looming and it makes sense to ink your long term deal now to avoid a case where you are an injured or ineffective 34 year old.
OK, so say Pierce signs a 4 year, $55 million deal. In order to match that, he would need to play out this season, and then sign a 3 year/$35 million deal. You don't think he could get that next summer?
And that isn't even mentioning the fact that there is a ton of competition this summer, and not that much cap space for a guy like him. Most of the cap space is going to be eaten up quickly by the younger guys, and then teams looking at older players are going to be looking for shorter contracts. There is a great chance he would get squeezed, and have to take a much smaller deal.
Ultimately though, it is way too much of a risk for him to opt out, unless he is willing to give up money, in order to change teams.