And having read the comments on the aforementioned article on rural land price drops I find this coincides with the info I've been given. Unfortunately Spanish companies seem to be in cloud cuckoo land when it comes to prices as do the sellers of anything second hand here.  I can buy the stuff new and ship over here from the UK and still beat their prices by more than 50%
As for not seeing land at these prices for sale just because the sellers expect X amount doesn't make it really worth that. Ditto for estate agents which could be a case of unscrupulous persons inflating prices for suckers for a fatter commission or, in the case of honest agents, unrealistic prices demanded by the sellers.
Bruixot