Why doesn’t the man book the seats downstairs?

M: I’d like to book a few seats for "Hamlet", please.
W: Yes, sir.
M: Have you got any seats downstairs?
W: Yes, we have.
M: How much are they?
W: $3.75 each.
M: Are there any seats for $2.50?
W: Yes, there are--upstairs. How many?
M: Four, please.
W: For which night?
M: What about Saturday, October 21st?
W: I can give you four seats in Row 8.
M: How long will the performance last?
W: Two and a half hours.
M: Thank you. How much will that be in all?