Its very understandable if he joins Bayern. Gets to stay in Germany. Compete for the CL every year and win the title. Bayern could offer him a better wage since they wouldnt be paying 50 mill euros. He would also get a year to develop at Schalke.
But two things that arnt in Bayerns favor. They have Ribery, Robben, Costa and Coman for 2 positions. How will Sane get game time over those ! Also surely Bayern cant agree a deal with Schalke right now but buy him in 2017. What if Sane suddenly gets injured/has a bad year or Bayern think they have another player who would be a better fit.
But two things that arnt in Bayerns favor. They have Ribery, Robben, Costa and Coman for 2 positions. How will Sane get game time over those ! Also surely Bayern cant agree a deal with Schalke right now but buy him in 2017. What if Sane suddenly gets injured/has a bad year or Bayern think they have another player who would be a better fit.