While I don't have 440lb subwoofers, I do have very large and capable main speakers and certainly a lot of subwoofer compared to the average guy. This never prevented my wife from marrying me or stood between me and a relationship. The issue is more that this hobby is expensive at this level and eats up resources that may be better put elsewhere. For my wife, it very much IS NOT for every dollar I spend on me she wants a dollar spent on her. It's much more practical, we have a 5 bedroom house and an unfinished basement. We have one child but want and expect to have more. We have a modest good living, but nothing great. For every dollar I spend on this hobby, it's a dollar that could be spent on something for the kids, something for us as a family, for a vacation, for retirement, for new cars, etc. Sometimes that is ok, but it all has to be balanced. Dedicating a room to my theater and another to my office leaves us with 3 bedrooms. That makes building out the basement into a theater space sensible, but even if I did all the work myself (which I cant do) the cost is high enough to, again, have to be balanced against other needs for that same money. The point being, I can never win this disagreement with my wife because ultimately she is right. Instead we both have decided to look at this as an expensive hobby that makes me happy, but that happiness cannot be at the expense of the family as a whole. If I want more bigger better subwoofers, There needs to be a good justification for such an expense, and not just because I want it or it would be cool.
My current system consists of two subwoofers which are 4th order bandpass designs each containing two 12" B&C drivers. Each is capable of around 125 db's at say 65hz, but only 106db's at 20hz. The 40hz on down is covered by two subwoofers each containing two 12" Dayton RS woofers. Sealed, so while I get more than 115db's total from those two, I think porting would have been a better option. Given that my theater is like 12' by 15' (i.e. tiny), this is probably enough I should be happy, but I'll be totally honest in saying I wish I had a room built out in the basement with eight 18" subwoofers in very large ported boxes. I want 15hz bass at levels I can truly feel, Which I'm sure is why NotNyt built his, and why you have such large subwoofers. I've actually used NotNyt's pictures here as examples for when people tell me I'm nuts. I tell them it can get much worse.