Listing the regular prices as $400.00 and $500.00 for these watches will never scream boutique brand IMHO. Something else that makes no sense is $30.00 more for the NH37 version. The cost of the NH35 and NH37 movements are almost the same. Add buying in bulk and we're probably talking pennies if that. The $149.00 with S&H plus tax would come to about $174.00 for me.
Splitting the difference might be a better sales tactic even though the pink sold out. Charging something like $134.00 for both models or charge the $149.00 for both, but include the S&H in the pricing as "free" S&H. Sure they all sold out, but pink usually does. The same uneven pricing structure on other models not in pink could possibly contribute to those hanging around a longer time.