Plus the requirement for gifts could sure be a burden in these times - though creative/free gifts could then turn into act of service - oh the confusion! I guess the size of the tank would depend on the happiness of the person...just a thought there. Certainly seeking a tank filling elsewhere kinda/sorta goes against the whole relationship aspect of the book.... just sayin' :-) Then, that could circle back to ones own ability to maintain their happiness, which may be easier on the relationship - right about now, I would say we could discuss this for days like you mentioned :-)