It might have been my observation while selling discs that players who were not "in the know" about disc golf (i.e. 85% of my customers) tended to think the JK Valk was a "women's disc" and should be avoided (since 99% of my customers were male) that caused this thread. That's anecdotal evidence for sure, but here is my thinking.
1. Innova really doesn't seem to have a problem giving signature discs. They gave signature deals to guys with one championship, so it seems like they don't have a problem doing it. Wiggins got one for the distance record. It's something they do fairly freely. We have to assume that it is "good for business" i.e. helps sell those discs.
2. Innova gave Juliana Korver signature discs when she came over as a 3X Women's champion. Since then they have NOT given signature discs to Des Reading or Val Jenkins when they also had 3 championships. If a 1X Borg or Avery disc wasn't an issue, why are 3X Women's Championship discs a problem. You have to at least entertain the possibility that sales of the JK discs were disappointing when compared to the sale of Men's signature discs and would be "bad for business." Otherwise, they are just misogynistic pigs. If that was the case, why would they bother to sponsor women at all?
3. Des Reading is the more interesting example since Innova seems to want to reward the Readings and support them for what they have done. The Readings DO have a signature disc, but it is not a 3x Des Reading disc. It's the Yeti, a putter celebrating a putting contest that nobody cares about (seriously, can you name anyone else who has won it?) that Jay is the 4X champion of. If Innova wanted to support the Readings AND they thought a 3X Women's Champion disc would help sales, why in the world would they not have gone that route instead of the Yeti? Again, you have to entertain the possibility that Innova from experience knows that a great disc like the Valk would see it's sales suffer from having a Woman's name on it so they figured out a way to support the Readings with a disc featuring Jay's name. Otherwise the idea that Jay has a signature disc and Des does not is preposterous. Once you allow the idea that the Yeti is a better business decision to get $$$ in the Readings pockets, it doesn't seem so odd.
Again, it's anecdotal. Innova doesn't talk about sales figures and they don't have to. We are not going to know the whys and hows of signature discs. However, Innova supports a women's team and they are a successful business. I have to think that if there was no downside to having a woman's name on a disc, they would have done it for Des and Val.