...that they already have a lot of interest in it?
I tried to arrange a viewing for a house we're interested in which has just been reduced by 50k and there was a lot of teeth-sucking and she offered me one time which we couldn't do (because we'd have had to bring 2 small dcs with us) and she said the house needed a lot of work (I know, that's why I don't want to come and view with 2 small dcs if there are floorboards up etc).
you know when you sometimes feel like they don't actually want to be bothered with you?
Or is it that viewing staff are terribly terribly busy people and IABU to want to take their time up in viewing the house?!