I don't think they never think about us. Do you really think they aren't aware that we exist, or that, even though they may chuckle at our fetish, they aren't grateful we exist? I guess the more relevant question is, do they consider our opinions when designing a product? In some ways we probably have similar desires to incontinent people, like pretty much everyone wants the most absorbent product possible. In other ways, we have different desires, such as a desire for babyish designs. Then they probably would defer to the opinions and needs of incontinent people since they are (presumably) a much larger group. And on other topics, like thickness, both the AB/DL population and the population of incontinent people may be divided. So then I would think they might do some careful market research and design different diapers for different needs.
They're idiots if they don't think about us at least once in awhile when designing products. Even if there aren't as many of us as there are people who absolutely have to wear diapers, you only have to look at the number of people on this board and realize we only represent a small fraction of AB/TB/DLs to realize that as a group we have a pretty significant amount of buying power. And you also only have to look on this board to realize many of us will buy higher quality, more expensive brands and lesser-known brands if they prove better, whereas many incontinent people (or the relatives shopping for them) might just grab whatever's on the shelf at Wal-Mart.