I gig and record regularly, but even so would only change my snare batter head about once a year, probably less. I have never changed the reso or bothered swapping the snare wires.
I bought this ahead of a run of shows as my snare was sounding flat and tired. Tuned up well, it now sounds like a brand new snare drum. I don't think it's something you need or want to buy every year or so - you could definitely get away with just changing the batter head and leaving the reso and snare wires untouched for a much longer period.
That said, if you are like me and have a decent but neglected snare drum in need of a spa day, this kit is perfect and seems like okay value for money.