That is by design. Banks figure your monthly payment as a percent of income. Then based on interest rates they figure out how much you can borrow. Then everyone - the sellers, the agents, even the bank - push you to borrow the max allowed and spend it. This is why lower interest rate cause higher house prices.
Interest rates are going up. Home prices have slowed. Speculation is over. Still waiting for the drop. The economy seems to have gotten really good at moving ahead in spite of pressure to slow. I fear there may be built up negative pressure that's about to give. Not sure though.