The 1989 Donruss set is considered a key set from the late 1980s era of baseball cards. It was the 7th set released by Donruss and contains 234 cards including base cards, rookie cards, stars, and subsets. Obtaining a complete factory-sealed set in pristine Near Mint to Mint condition today would be quite valuable for a few key reasons:

The 1989 Donruss set featured some legendary players who were either in their primes or early in their careers at that time such as Ken Griffey Jr., Barry Bonds, Cal Ripken Jr., Greg Maddux, and Nolan Ryan. Several of these players have since been inducted into the Baseball Hall of Fame and their rookie cards from sets in the late 80s/early 90s command high prices. While none of the Hall of Famers had true rookie cards in the 1989 Donruss set, their early career cards hold value as they were capturing great players before they cemented their legendary status. Cal Ripken Jr.’s card for example holds value as he won his second consecutive American League MVP award in 1991 and went on to break Lou Gehrig’s consecutive games played record.

The 1989 Donruss set had rookie cards or early career cards of other notable players like Juan Gonzalez, Jeff Bagwell, Bob Welch, Dennis Eckersley and Bret Saberhagen that appeal to collectors of those players. While not all ended up having Hall of Fame careers, they were impactful Major Leaguers in the late 80s and early 90s. Simply owning a complete set with many stars and emerging talents enhances its collectibility and value.

Population reports show the numbers of high graded 1989 Donruss sets extant are quite low when compared to other flagships sets from the junk wax era. PSA has graded a total of just 25 complete 1989 Donruss sets in Gem Mint condition and only a few dozen more in lower Mint grades. The sheer rarity of finding a set in pristine condition, still factory sealed and never looked at increases the value and appeal to vintage card collectors.

Demand for 80s and 90s sports memorabilia has climbed steadily over the last decade as the children who grew up during that era have gotten older and nostalgic. With the rise of social media, shows like Topps’ “Everything Comes Down to the Cards” on YouTube have also exposed newer generations to the golden era of baseball cards and renewed collector interest across several demographics. Especially for a set from the late 80s featuring young future superstars, this has helped the 1989 Donruss retain relevance and strong marketplace demand three decades later.

So in summary – considering the star power of players featured, steep population decline odds of finding a pristine graded example, and sustained popularity of the late 80s card aesthetic – a PSA Gem Mint 10 graded 1989 Donruss baseball card set in its sealed factory wrap if offered at auction today could reasonably be expected to command a final sale price upwards of $25,000. For collectors seeking a complete representation of that era in the finest condition possible, it would represent a sound blue chip investment in the hobby.