Discussion about Liverpool possibly spending much on player like Isak highlights that top young players are very expensive. While it might make huge offer for someone like Vinicius Jr. look cheap his value is also based on his age and popularity and importance to Real Madrid not just his performance. Fact is that another club like PSG is also interested could drive his price up even more. Your idea to sell Vinicius next summer is smart as it would give Real Madrid another year with him potentially increasing his value further and give club more time to find replacement and get better deal for him.