If you're doing well with SL (system which most Apple customers consider the pinnacle of OSX), and need a system to do serious work with it for a living, why upgrade, since you'd be limited to a possibly unstable 32-bit system (the 32-bit part is not a possibility, but a certainty)? The question is specially valid if you have Xcode coding in mind, since it simply won't work on your system.

Otherwise, if you think about it as a kind of enjoyable science experiment, or if a 32-bit system suit well your demands and you're willing to investing a lot of time fine-tuning your machine, or both (my case), then you should keep on trying.