dont get too stuck on the msrp,the guys who are pulling down the serious cash are the ones who throw the msrp out the window & base profits on volume as oposed to treating every customer like the next big whale.
if you give a guy a deal good enough when he decides to upgrade he can put a few bucks in his pocket instead of loosing a fat wad that same guy will be back .
yes bass response is important & try to carry speakers that offer great bass,not audiophile bass but real chest pounding bass like maybee vmps speakers or somthing along them lines where big buck speakers dont require a sub to give up some real bass.
if it were me i would try to carry brands that are offer ht as well as 2 channel & that are selling like hot cakes right now like krell,mcintosh,pass ect,these brands offer a massive established customer base & also are priced so high that there is a huge amount of room between your price & the msrp :)
somebody above mentioned selling used gear,bad move,take all trade ins right to the internet & get them off your sales floor & the same goes with any consignment gear,straight to the internet.
from what i know & see in high end audio sales the guys who try selling by the book dissapear quickly & the guys who sell with loopholes build new show rooms & sell the most gear.
mike.