In the case of the Ferrari... I'm no fan of Ferrari's anyway.. more of a Porsche 356 man myself; by all means throw one my way.. I'll give you a quid.
In the case of SW, value isn't at all important... I wish it were all cheaper. Having a collection is just that, a collection. It has nothing whatsoever to do with value. For me its about completing runs, making sets, getting something new and different to oggle at and enjoy. Funnily enough most of the super high priced items have less interest to me; maybe the price is a bit of a turn off, but they are often just not my thing. Sure if they were £1 I'd pick them up to complete the sets, but they are not something I aspire to owning due to their value.
In the modern sector, I buy Force Attax cards, they cost a £1 pack, I keep them as clean and mint as I can, file them, keep them perfect. The fact that the vintage is old, makes not difference to me. If I collect it I keep it as perfect as possible, no matter what the 'value'
I guess if value was all that was of interest I'd buy shares instead and look at a spreadsheet all day instead of my collecting room...