A home without a bathtub would narrow your market a little. There are still some folks who want to relax in a warm tub of water. However, there are a growing number of folks who want the oversized shower with jets comming out from different directions. Even Jacuzi has a massaging shower.
Jacuzi and the multiple jets appeal to the under 50 crowd and the shower without a tub to climb over appeals to the elderly, arthritic, and paralitic. My personal opinion is that I favor the shower provided it has multiple jets, nice ceramic tile, mood lighting and such. Incidentaly I'm 65 and in good health.