We are on the V de P now, just past Salamanca (amazing city) we are on a campsite just N of town right by camino, as all albergues etc full - busy weekend in town!
We started in Cadiz and have camped out at least 3 out of every 5 nights. Wild camping mostly except when we wanted a day off to visit city (Merida for Easter ) it has been very easy to find a spot to camp, many grassy areas on edges of villages and beautiful oak forests on the way. (Especially the section leading to Caparra). Yes some forests are fenced off earlier on the route, but there is always unused bits of land too.
The main thing is water, sometimes even houses are few and far between so it is important to have enough!
So do camp! Spend some nights in albergues- it's great to meet the other pilgrims and have a shower - but it IS expensive to do so every night... We are on a budget as is our Thai friend, so we balance the costs by using more basic albergues, and wild camping more. This has given us a wonderful journey - waking up under the oaks near Caparra with white horses peering over the wall was magical! But so was our 'expensive' night (albergue AND dinner!) at the lovely Calzada de Bijar when we arrived exhausted and spent!
( ps we are a group with 3 tents - and use small shops wherever possible - keep it local!)