My point is that you charge market price. Because that's how markets work. Price to rent ratio varies very widely between different markets. If you don't want

My point is that you charge market price. Because that's how markets work. Price to rent ratio varies very widely between different markets. If you don't want to buy in a market with a high price to rent ratio that's fine. There's simply no rule that guarantees a price to rent ratio such that rent covers all costs plus the full payment on a 30 year mortgage in all markets at all times.