I'd always encourage anyone who can afford it to pay the full adult maximum fare regardless of what discounts or shorter fares are available, if you want to see these railways still operating in five or ten years time.
I /used/ to do that; I probably come in the "who can afford it" bracket; I used to buy day rover (where there was one) even for one return trip; it was a simple way of supporting without faffing around with donations etc. I also used to decline any 60+ discounts (where there was one).
However. That was all in the years BC (before covid).
What adds up is not just the cost of the fares, but all the other items. Not just the cost per mile but total cost on the day on the line.
I used to - BC - buy food/drink in their refreshment outlets; now the price of this has rocketed everywhere - and I do not think £3.30p for what I would call a 'medium' sized disposable plastic cup of tea is good value for one tea bag floating in hot water with a little milk; that is now of the same order of 1 pint of ale in some places; where available I also used to full breakfast - assuming the facility was open before the first train ran; at one location their breakfast fee is now higher than the per night add-on charge to the hotel I use there. On top of that, hotel costs have rocketed since covid. So, I have cut back - I now do take up whatever discount is available, 60+ if there is one or any other offer, and, yes, my food and drink for the day is now (usually) from Tesco (or equivalent) 'meal deals' or that ilk. Of course I accept hotel prices are outside control of the heritage railway concerned nonetheless it impacts on total visit costs.
I do agree with the point made by others these venues are aimed at 'normals' and us anoraks are a minority; all I can say on that point is family days out must cost a packet, and something I have managed to avoid
Crich. Trams are not my main interest, in fact they are down the list somewhat, but for some time I have considered it ought to be a place to visit, which I never have. I have done Seaton (only because I was there for other reasons) - unlimited day rover (no donation) now £12.70; also do Volks usually annually (not this year yet though) £6.50 => I perceive Crich to be expensive without actually ever being there to see what is on offer bearing mind preference is for travel on assorted types etc, slightly less interested in static museum items. Volks mid summer gets you 4 cars for haulage; varies by day but so does Seaton; but from what I understand aside from events days Crich does not offer 4 on a normal default operating day ? TBH reading this thread kind of puts me off a Crich visit. (For ref. the only other heritage tram line I have done is Summerlee and that one is free; for the few metres there it ought to be; again only did his one 'because it is there' between 318/320 EMU moves.)
Digressing, despite commuting past the place for c.30 years, I had never visited the Hendon RAF museum until 01/24. OK I said less interested in static museums but that one is WOW even though my aircraft interest is with civil not military; it took me nearly 2 hours and 3 circuits to find things of engineering interest and know I missed a lot. And it is FREE. Sure the funding basis of these things is totally different and I am not attempting to make any comparison, more to compare with the next item : the LT museum at Covent Garden. IMHO on the face of it the standard adult admission of £24-50 which covers a year might seem value considering its Central London location but TBH - from the anorak view - I do not think it worth that much and can't really see why it would need repeat visits in the same year (or perhaps they know that so annual entry is a gimmick never taken up by most?). At least I can do that one for free
(( Recently I did look into Ironbridge around a SVR visit ........... kerrrrchinggg ........... I can't comment if it is worth it or not but it seems a lot to me from checking out site by site what they have on offer.))
Anyway what I am getting at is not just the value of the fare or pounds per mile - but pounds per visit overall.