The same person

A house. A hair brush.

At first glance, it seems like the marketing campaigns for these two items would be extremely different. The campaign for one would try to get someone to make a small decision; the other, a huge decision. But the same person who buys a house will also buy a hair brush.

Her attention span won't change: you don't get much more time to pitch the house than the hair brush.

Her tastes won't change: she recognizes what she likes and doesn't like intuitively.

Her gender won't change: she may make color the deciding factor in both cases.

If she's a smart shopper with a house, she'll be a smart shopper for a brush.
If she's not a smart shopper with a house, she probably won't be one when she's buying anything else.