Well I wouldn't think so, although I'm not an estate agent. Who is to say you won't offer €415 on the one with the asking price of €510. Most people these days are viewing houses with asking prices above what they can afford, given that offers well below the asking are being accepted in by many vendors in today's market. I think its only natural that people would want to see and compare all the houses for sale in the one street, to see which offers the best value for money. I wouldn't think this automatically means you have a certain budget to spend.