Architectural Beauty?

My husband keeps saying he has one more house in him before others describe us as 'elderly'. For over 20 yrs now as he was renovating and building additions on our house he has collected info about dome homes. These homes make the best use of square footage and are certainly different enough to appeal to our unusual tastes. The problem is these structures are not my favorite and, while their resale value is very high their appeal is to a limited audience. But should every decision be made on what is practical? What will bring the most financial reward? The thought of my husband being very elderly and saying 'I wish I had built that one last house' makes me sad. I think I should support him in this dream.