In some of the media that I have read there has been an oral agreement between the two, but the issue of discussing salaries has not been discussed further because, as Besiktas said before, they have difficulty meeting Sergio Ramos's too high salary. I also see Sevilla being far less likely to agree a huge salary for him unless as you say Sergio Ramos is willing to be given a salary below what he wants.
Speculation regarding the future of Sergio Ramos seems to be getting brighter and he will have a high chance of returning to his home club when he starts his career because he has reached an oral agreement. I think the transfer free factor is keeping Sergio Ramos from deciding so quickly about his future and maybe he is considering playing with his home club before retiring or going to Saudi Pro Legue.
logically it might win Sergio Ramos wants a big salary from Sevilla but if you look at his old age, of course his performance will not be as strong as before when he was young and of course the quality of playing will also have an effect here so if Sergio agrees with an offer from Sevilla I am sure that Sergio will accept salary regardless of the amount rather than a large salary but have to go to saudi arabia.
one hand, we all know that Ramos not want to leave Europe and continues his career here until he finally decides to retire.