Furthermore... My son also plays bass, he's 17 now, started on DB in orchestra in 6th grade. I bought him his first electric for Christmas in 7th grade (a starter ibby) He now plays out several weekends a month, plays a Fender Jazz 24 through an Ashdown MAG rig and has also branched out to playing guitar and synth as well.
Know what he's most proud of? The only thing that was ever bought for him was that first ibby (which he still owns and uses) every thing else has been from mine he's scrimped and saved for with jobs and $20 here and there from birthday/Christmas cash from the grandparents.
When I've been to his gigs where other bands have played and it's obvious that the other bands have gear bought on mommy's credit card or where a dad is pushing around the sound guy; he, and the other guys (and girl) in his band come up and say something to the extent of "thank you, we're so much better off because we've done this on our own"
If you can't afford it yourself, you don't need it. Trying to trick your parents into buying new strings because of something you've read on here is the most ridiculous thing I've ever read on TB.
Best yet, put down the damn computer and go practice... Using your DR's.