Not worth the trouble in my opinion...

I can find new tubes for $2-$3 when I have the time to look in advance (and if I run out, there is always Walmart (Bell brand tubes are $5, or REI for $7). I've had very good luck with a minimal number of flats over the past 20 years. And I have become very good at patching tubes due to lots of practice when my kids were young and they seemed to get a lot of flats). My rule for tubes is: patch no more than twice, and discard if patches will overlap, or when the tube starts cracking anywhere regardless of the age.