would it be considered being worldly and materialistic and an overall poor investment (spiritually speaking)?
This is the general opinion among JW's where I live. Comments usually follow the thread that the time maintaining a home could be better spent in field serve-us, if you have a home you should do what Jesus told the rich young man, "If you want to be perfect, go sell your belongings and give to the poor and you will have treasure in heaven" the poor being WT, JW's are going to lose everything anyway in the great persecution so why own a home you cannot keep, and many more judgemental statements.
Fortunately I was taught different by my parents, even though they were solidly PIMI before they got kicked to the curb when they were older and less useful to the WT. Work hard, save, purchase property, and I was able to retire comfortably in my late forties, and enjoy a paid for home.