Is it just a difference in mindsets/goals?
Mindsets:
Need to get as much as I (rightfully) can by charging market value vs what do I care about market value, my costs on this are X so I can charge X + profit margin and that's all the hishtadlus I need to do.
Goals:
Cover a mortgage/home expenses so I only need to charge my costs to offset the house vs I need to buy a new house/new car and therefore need to get market value so I can translate that into a new house/car for myself.
A rental apartment is an income stream along with salary, investments etc. that helps cover one’s cost of living. I’m not sure why it would be viewed solely in the context of mortgage and home expenses. If one’s tuition, groceries, car payments, clothing expenses, and just about everything else in life are going up wouldn’t it make sense to get market value for your asset to cover those expenses?
I would go into the propriety of asking for a (tzedaka funded) tuition scholarship , or choosing to scrimp on a tutor, private therapy, or other expenditures that would help one’s kids while leaving $10,000 annually in rental income on the table to be a “nice guy”, but that’s probably for a different thread.