I have been thinking about this ...
Among today's players, whose name still hase enough star power to sell gloves? Thanks to 24-7 coverage of every dirty detail of players' lives today, and the negative perception that too many ballplayers are overpaid prima donnas anyway, glove companies might consciously be steering away from stamped autograph endorsements. How many of y'all would buy a Rawlings HOH with "Alex Rodriguez" in bold script across the palm? Roughly half of you. The other half of you can't stand the guy and don't want anything that is associated with him.
Have any of you noticed how the number of references on ebay to "the glove that Barry Bonds uses on gameday" has slipped lower and lower this year compared to two years ago?
Do you think Roger Clemens can sell any more TPX gloves?
Back in the day, I think major league ballplayers were national icons, not just regional or local stars. And our national icons had a much better reputation, deservedly so or not. Mickey Mantle's name probably sold a kajillion Rawlings gloves over the years, and not all of them in New York or Commerce, OK. But, I would be willing to wager my one and only Cal Ripken baseball card that the popularity of his gloves took a nosedive in his later years, when it became well known that he was a philandering drunk. And then, his heroic facing of his demons in his last days "re-popularized" Mickey Mantle, and his endorsed gloves have been doing a brisk business ever since.
I have noticed that endorsements from certain ballplayers seem to doom a glove. On e-bay, compare the prices of Jose Canseco's endorsed gloves with the prices of Junior's, Ripken's, or Tony Gwynn's. I believe Reggie Jackson's gloves are less appreciated, because a lot of us didn't and don't like Reggie Jackson. You can get Mark McGwire first base mitts for little-o'-nothin'.
Rawlings probably noticed that we have lost our starry-eyed-edness when it comes to today's players, and while A-Rod may be very popular with half of the customers interested in new gloves, his name will be a put-off to the other half of potential glove buyers.
All of these theories of mine, of course, are based on circumstantial evidence, non-scientific casual observation, and my opinions.

Yes, I still have my first glove.