What is the average dealer mark up?

heaudio123"BestBuy runs a GP of around 23-24%"

Actually they would be bankrupt if that were true you clearly lack sufficient sources, data, and  information to reliably state any thing about Best Buy profit.

clearthink  - per the Wall Street Journal BestBuy's  gross margin for 2020 was 22.86% , and a net margin of 3.53% (net imcome).  What are you referencing to contradict headaudio123 and the Journal?

That said can you blame a customer for attempting to secure a better price?

@4425 - no. Everyone wants the best price

You would think they would advertise to a highly selected mailing list.

@larry5729 - most dealers do this; at least the successful ones

Let me offer some special words in retail that mask the real costs and flow of money

barryaudiophile - I don't know what products you carry as a dealer, but I never had a single audio manufacturer or distributor offer a co-op, rebate, spiff, show special (only to customers) or program (whatever that means). Most audio manufacturers and distributors are small, unsophisticated firms from a marketing perspective