I probably fall somewhere between the serious videophile and joe average (six-pack?) on these things, so take this for what it's worth.
I think there is a sweet spot in audio/video components where I feel no urgency or urge to buy anything else because what I have is good enough and satisfying. There's a feeling of confidence and comfort when that spot is hit. My Kuro 111FD fits this description. So I'm confident I won't be buying another TV unless necessary (i.e., broken/damaged beyond repair, stolen, etc.). Those for whom having the best or latest is important or are more technically-minded might have a different perspective. And while there have been a very few occasions where I thought a 60" might be nice, that thought never translated into a search for a replacement.
I suppose another factor is that I view things audio/video as an interest rather than a hobby, so I'm less inclined to become driven to a negative (for me) degree in its pursuit.
VPI, Grado, SME, Pioneer Elite, Magnum Dynalab, Oppo, DVDO, McIntosh, JJ, Mirage, Kimber, Transparent, MIT, Pangea, Wireworld, Shunyata, PS Audio, Furman, Sanus