Personally, I would not bother writing to anyone regarding the price of All Line Rovers. Yes, they may seem expensive, (and yes they are expensive), but a quick comparison to some of the "Anytime" fares out there will show that you can get good value out of them.
I've discussed ALR's with a pal of mine at some length & we're both of the opinion that too much "rocking the boat" would probably lead to the ALR being withdrawn from sale. It's a product quite a few TOC's don't like, but have to put up with & they would be only too glad to see its demise.
Members of Rail.UK. forums will no doubt recall what happened after Lord Adonis gave some publicity to the product a few years back - some TOC's promptly slapped restrictions on use of what was a previously unrestricted ticket, which (for example) now make it's use on the Midland Main Line in the morning peak almost impossible.
As for me, going abroad is generally much better value as with some careful planning, you can have a week's travel & accommodation for not much more than the cost of a 7 day standard class ALR. I appreciate that's not everyone's cup of tea, but I can't honestly see me having an ALR again.