mostly i do it these days to help others complete thier dex's.
Been thinking of getting a battery from
http://www.citylabs.net/ to put into my gen1 and 2 games of which silver is the only one pictured here. they have had thier batteries replaced with supercaps and every 3 months i just need to turn my gameboy on for 20 seconds and they are good for another 3-4 months