As to the value for money question - I feel this is unanswerable really. But I'll have a go anyway...
If you like and want the SVX then it's worth it. 
If you're asking - "Does the price of the SVX accessories justify the price increase over the standard model" - then I'd say no, it does not.
In terms of value, the front seats are probably the most expensive item which go towards "justifying" the price - but the other stuff can be sourced elsewhere for less money and these outsourced items are arguably not only better looking products, but are, in some cases, perhaps more functional.
My OL bash plate for example - $350.00 installed - 10mm thick alloy with holes in it which allow airflow. The LR part is in my opinion is just not as good. It certainly is much more expensive.
I wanted a white Defender for a start - so never considered the SVX at any price.
Other things that the SVX has - I don't want on my vehicle, these include - side rails, sunroof, sat nav, stickers, the silver bubble grill, the wheels it comes with, carpet etc. So for me it was always going to be a stock 110 that I could modify as I saw fit. Don't get me wrong - I bought mine with many genuine accessories - but (Mr. Land Rover) - how about putting a snorkel on it - or checker plate wing guards? Rather than a daft looking grill.
As to resale value - I'm going to be cremated in mine, Viking style, so that question is irrelevant. 

2007 Defender 110
2017 Mercedes Benz C Class. Cabriolet
1993 BMW R100LT
2024 Triumph Bonneville T120 Black
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