What is the average dealer mark up?

Here is an example of a quarterly P&L 
Revenue: $170,946
Cost of Goods Sold(COGS)$88,244
Gross Margin:$88702
Gross percent: 52%
Operating Expense $21,946
Operating Income:$67,106
Taxes: $9927
Depreciation: $1025
Total Expenses: $114,692
Net Profit: $56,254
Profit percent: 33%
This is a synopsis of a company that I worked for many years ago. A short example of where the profit goes. Unfortunately most people never look at a companies P&L statement and only look at the Revenue at the top.

The "high end" tweak hawkers will never disclose their margins.  People would riot.

I don’t mind disclosing my margins. They’re 1”, 2” and 4”. 

Well I don’t hear any riots so people clearly don’t care about your margins much like your products.