Personally I don't think it's worth the $40 considering that I'll never use the vast majority of the listed features.
So, because you're so reticent to change, or have no desire to adapt to Apple's newest direction in computing, you would forgo an upgrade? At least the price is so low that upgrading is no real problem. Imagine if Lion were a Microsoft product - it would like be $450 or so
Seriously, don't sell yourself short. I would advise purchasing Lion, backing up your system, backing up the Lion install to a DVD or 8GB thumb drive, installing Lion, then using it for a few weeks. To say the upgrade is not worth the small price makes no sense. You obviously upgraded before, when the price was $129 - what is it about Lion that, now, makes it not worth the price? I will wager that there is a corresponding list of features, of which you'll "never use the vast majority" for Snow Leopard, Leopard, Tiger, etc...
Don't get me wrong. If Snow Leopard is good enough for you, then by all means keep with Snow Leopard. Just don't fall into the same trap as the vocal minority on this forum that only seem to be interested in bashing Lion. That actually seems to be the most popular activity here - bashing Lion, that is, and often with little basis.