Well, I'm guessing they would sell way more Harleys than they would Ben Solo or Hux. The ST figs overall have seemed to be pretty poor sellers - there always seem to be tons of ST troopers and Finns sitting for years, and even Rey and Kylo don't seem hard to get.
Some ST troopers I've seen for prices you NEVER see HT figs available for at major/online retailers - like half price - which says these are just total sales dogs. Yet... HT does yet another ST trooper with the jetpack guy.
All that being said, I really think HT dropped the ball by not doing a pilot Poe and would be crazy not to do Palps from TROS. I really want both of those, but my guess is that appetite for Poe has waned to a point where it's over and maybe they feel they already did Palps with the ROTJ version.