I really think RSH may have miscalculated with this one. There are loads of unhappy customers posting on their FB page, and saying that they will go elsewhere now. I guess that RSH figured that if it works for thetrainline it will work for them. The difference is that ttl have a massive advertising campaign that's been going on for years, so much so that some people think that is the only place you can buy online, or get "cheap" tickets. I've hardly seen any advertising from RSH.
Also, I suspect that a large proportion of RSH's customers are more "in the know", and actually used them because they charged no fees.
So, now I'm dumping RSH where is the best deal (cashback or whatever) to get train tickets? I'm signed up with EC, but they only give out points if you spend over a certain amount.