It's usually 16% gross margin, with a few exceptions, accessories can be a lot more. There are also various programs for dealers who keep medium format gear on display. There are no kickbacks/co-op, but if invoices are paid early there are prepayment discounts.
I'll share a few from an obsolete two-year old price list.
Leica S: $21,950 $18.218.50 17%
Summarit-S 1:2.5/70 ASPH (E82) $4,995.00 $4,145.85 17%
S-Camera Battery 270.00 180.00 33.33%
S-Lens Cap E82 90.00 45.00 50.00%
Leica X Vario (Typ 107) 2,850.00 2,422.50 15.00%
Leica X Vario Hand grip 160.00 90.00 43.75%
X2, Black 1,995.00 1,695.75 15.00%
Leica M, Monochrom 7,950.00 6,678.00 16.00%
Leica M, Black Paint (Typ 240) 6,950.00 5,838.50 15.99%
50mm / f0.95 ASPH. (E60) 10,995.00 9,235.80 16.00%
50mm / f2.0 ASPH (E39) 7,350.00 6,174.00 16.00%
M9/M8/M-E Handgrip Black Paint 300.00 210.00 30.00%
M-Multi-functional handgrip (for M Typ 240) 895.00 751.80 16.00%
Leica Handgrip M (for M Typ 240) 300.00 210.00 30.00%