Having just walked the Coastal and the Senda Litoral six months ago, I can honestly say that the numbers of pilgrims on these routes were astounding! The albergue in Vigo has over 90 beds, and both nights we were there on the separate routes, it was full! It is definitely the largest albergue on this Camino.
Because the routes are on the seaside, already tourist destinations, I would agree that many pilgrims are staying in non-albergue accommodations. The seaside itself would attract a higher-end tourist-type pilgrim. We tended to avoid the albergues because of the sheer numbers of pilgrims we saw. We were not interested in a bed race, and we could afford to stay elsewhere. Almost everyone is attracted to the sea and pilgrims are no exception. Walking a pilgrimage by the sea, seems like an archetypal experience to me!
I was also astounded at how many pilgrims I met who said the Coastal and/or Senda Litoral was their first Camino! In my mind, this has shifted significantly over the years along with the numbers. The Camino Francés may be losing its luster as the "real" Camino. And yes, Porto is much, much easier to get to than SJPP.
I did feel that the Coastal Route, especially when it didn't follow the sea, felt more like a Camino, with hills, crosses and Roman roads, but yet, the seaside Sendal Litoral is also Camino-like in that you can find lots of pilgrim comraderie. It's easier, flat and on lovely boardwalks that are easy on the lower extremeties! What's not to like?
Regardless of my thoughts, what will be, will be, and hopefully as this pilgrimage grows, so will the orderliness and oversight by the powers that be! Incidently, there are also many more pilgrims on the Lisbon to Porto section. I will tackle that section in a week and report back on that one!!