Even if it isn't harmful, it isn't usually a particularly productive combination. Say I wanted queenbees when I currently have a male lesser bee and a female bumblebee. I could get my queenbees from breeding the two, but in the end I think it would be a more productive use of my female to put her to a different male and think about the queenbees in a later season. Since it's reasonable to assume at this point that super spiders don't exist, why would I double up spider genes when I have other options available? My males breeding potential as a two-gene animal are essentially being thrown away. I suppose I have increased odds of spider combos, but it still isn't enough to justify the pairing in my head when I have more appealing choices to pursue (my cinnapin or my calico pastel are certainly much more attractive mates for this girl!).
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