You buy a house today for $700,000
Your payment is $4,000 a month for 10 years.
Over 10 years you payed $480,000 in payments
Your house is now worth $1,000,000
Your balance on your loan is $600,000
$600,000 balance + 480,000 payments = $1,080.000
But the house is worth $1,000,000
What happen to the $80.000
Note there are other costs (Taxes Insurance Etc)
That $400,000 in equity is less then what you payed $480,0000
You basically each month buried it in the so called backyard.
Think about it you payed $480,000.
But you have $400,000 in equity