When they traded Stephon Marbury and Penny Hardaway to the Knicks during the 2003-2004 season, one of the things the Suns received their 2010 unprotected pick. They then traded that pick to the Jazz in order to unload Tom Gugliotta's contract (which was expiring at the end of the season) so Jerry Colangelo could save that much more money before he sold the team that off season. Cost cutting move that did nothing to improve the roster.
That off season, they wanted Andre Iguodala at #7 but didn't think he'd be available. The way Antoni works is he has a very short list of players he wants on draft night, and if none are there, he's too stubborn to draft someone else, so he sells the pick. He and the Colangelos agreed to draft Deng at #7 and then trade him to the Bulls for Chicago's 2005 first round pick. It turns out Iguodala was available at #7 anyway

. Also, Colangelo felt JJ didn't deserve the extension he wanted, so he decided to risk it and let JJ become a restritced FA next off season.
Then the 2005 off season hit after a 62 win season, they had the Bulls' pick (#21 overall) and decided to throw it in a trade with the Knicks since they didn't want to use it. So little do people know, Nate Robinson was also given away by Phoenix. In 2004, JJ wanted 6 years 50 million, but this off season Atlanta offered 5 years 70 million that Phoenix had the choice of matching. JJ felt insulted by the low ball offer Phoenix gave him, so he did everything he could to ensure they didn't match. They wound up signing and trading him for Diaw, Cleveland's 2006 first round pick, and ATL's first rounder that was lottery protected in 2006, top 3 protected in 2007, and unprotected after that.
2006 off season. They again have the #21 overall pick, and again Antoni had a very short list of players he wanted, Thabo Sefolosha topping the list. Since he wasn't there at 21, Antoni decided to use the pick to unload Brian Grant's contract (which wasn't very big at all, and was expiring a year from then). He agrees to draft Rondo and trade him to Boston.
2007 off season. ATL manages to get the #3 pick, which was terribly unfortunate cause if it was #4 or worse Phoenix would have had it. The 24 pick comes around, and none of the players Antoni loves are there, so he and Sarver agree to sell it to Portland and draft Rudy Fernandez for them, which is stupid cause if they draft Rudy they would gotten to wait a year to pay him. Later on, the Suns are beyond the luxury tax threshold, and Sarver wants to get below it cause he's a cheap . Antoni says to him, "I'm not going to use Kurt Thomas, I regret using him against the Spurs. It goes against our philosophy. So Sarver goes to Kerr and says trade Kurt Thomas ASAP to a team with cap room, include draft picks if you have to, Antoni never uses those either.
That basically sums it up.