If it saves you money, then it loses them money!
That's a bit simplistic (as I'm sure you know); Advance fares can save me money but clearly TOCs believe that they increase revenue.
Many people have an alternative to commuting by train - if the train isn't financially viable then they won't use it, so no revenue for the TOC at all. Those who would use the train anyway may save, but whether these outnumber the potential new travellers will depend on the route and offers available.
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A season ticket is alot of money for just 3 days use - I may have to consider doing more days in the office to make it worthwhile. Or maybe I will go for singles in the hope that they may actually introduce a carnet at some point in the future. Thanks all for your advice.
You can get a refund on the unused period on Season tickets (minus £10 admin fee IIRC), so if you decide to change you wouldn't have paid more than necessary.
A Season is a lot less hassle - no stressing about ticket machine queues - and as
island says, a Gold Card gives you very good discounts on other rail travel. Your Season would cover any leisure journeys to London or to
any station on any permitted route covered by your Season, which would include routes via Maidstone, Tonbridge etc; possibly via Redhill but I'd need to check that.