I have an inground pool with spa that was built last year that is salt water. It seems pretty self sufficient but I pay a pool service company $125 per month to come out once per week. I noticed recently that they are at my house for all of about 5 minutes. They turn on the pool, which is normally on a timer and starts on its own later in the day, skim the pool for leaves and usually head out. They don't test the chemicals, they don't treat the water, they don't clean out the skimmer. Then twice a year I pay them $90 to clean out my pool filter. I don't see the value in this. Is it worth it?
The value proposition is usually worth it for an average homeowner. But this assumes the team is doing what they've committed to do and that you aren't interested in doing the work yourself.
The former I can speak to, but the latter is a question only you can really answer.
As far as your service team, do they offer comprehensive or do they only do certain items that were listed on a service contract?
Chemical balance is paramount to the Service, and if nothing else, is what the pool guy should be managing. Are you witnessing this ignorance in real-time or is this an assumption based on time spent at your home? Have you tested your water and confirmed the balance is off? A technician won't add chemicals if they are not needed. Winter months generally result in milder swings and easier chemical balance.
We meet pool teams who neglect pools all the time and shouldn't be making promises they don't keep. But we also know that a well managed pool should result in quick visits. This is how a pool service profit margin is achieved. If the pool is managed poorly, the visits take longer and the efficiency is lost.
Prevention is fast and easy. Recovery is messy and hard.
If the pool team understands this, and your chemistry is good and your plaster in good shape, I would thank them for being so stellar.
If your chemistry is off or your pool is dirty and staining over time, find another service quote or commit to learn and do it yourself.
Good luck!