In negotiations he makes exorbitant demands, and the other side counters on the spot.
Tips
usage
Almost always pejorative — implies the seller has no honest basis for the price. Often paired with 就地还钱 (counter-offer at rock-bottom) as a set haggling couplet.
memory
漫天 literally 'filling the sky' — imagine a price tag so big it blots out the sun. Then 要价 = 'demand a price'. A sky-sized ask.