It is always a benefit to maintain a certificate. I had a lifeguard certificate I would renew every few years even though I was no longer an active Lifeguard, but the renewal training did help maintain the skills needed, to get myself and or others out of trouble.
Continuing or updating of ones skills/education that should not be ignored, you never know when you will need them for a just in case things in life go wrong.
edit: Oh I forgot, congratulations.
Thanks!
Yeah, it's not too expensive to maintain, so I might do the same thing you do when I move on to the next thing.