A couple of other factors to consider (in no particular order)
- many of today's guitar players probably collected something when younger (comic books, POGs, Beanie Babies, whatever) where the exchange value far outweighed the use value, plus a dose of (often artificial) scarcity.
- the internet (ebay, reverb, guitar forums) makes distance or scarcity not really factors in attainability. If someone is selling X or Y somewhere, you can buy it. (Corollary: record stores are less fun since there's a discogs)
- pedals are relatively standard (minimal variation between examples in the same model, except where the pink label is way better than the green label / the one with the horse is better than the blank one or whatever), so less worries about buying remotely
- pedals are easy to ship (and therefore flip)
- pedals are (relatively) cheap purchases (that are a "gateway" to more expensive ones, of course, as we become acclimated to the price... oh, a $200 chorus pedal... click "buy")
- pedals don't have the same opportunity cost as other musical instruments/tools--you can have three delays on your board, but bringing three guitars or three tube heads to a gig is not really practical. In fact, it's now absolutely normal to have a ton of pedals (often with a total cost of more than the guitar or amp, etc.).
I do worry some about relying too much on certain pedals/sounds and that new effects may be too contemporary (therefore eventually too of the era). That said, there are some great guitar sounds on records these days that would have been out of reach for most people 20+ years ago. I'm sure we'll all look back on the 2010s with a similar view to gated reverb drum sounds in the 80s, etc. So be it.