For example, there is a super expensive "on location, available light" photographer here in Atlanta and her work is indistinguishable from all of the $100 shoot and burn "on location, available light" photographers. As far as I can tell, she isn't working much. They all have the exact same style (flare, bad 70s Lightroom filters), so why would the average person pay more for the same product?
And if you are shooting film, the last thing you need to be worried about is keeping it affordable, unless you want to work your ass off and never have anything to show for it. I can promise you there wouldn't be a dime of profit in a film based 8x10 that costs less than $300. Sit down and calculate your cost of sales, all the time it will take to process, proof, develop and print, plus handle all the client calls, emails, sales meetings, session time, etc. It would be very challenging to keep it affordable. You're far better off serving fewer clients at much higher prices.