A fast trainers market value rises extremely fast, while their wage is fixed for 1-3 years. Therefore the ratio of wage vs marketvalue will be higher with fast trainers. In my limited experience this high ratio is already there when they're generated, so the player with the lowest wage compared to his MV will be the fastest trainer generally speaking. If the player has already been with a team this effect becomes greater of course. Some players in my squad that have been with me for a season are nearing a 1/100 ratio. I have no idea however what wage this player will be asking for when sold, but renewals indicate that the effect is still there, depending on how active the player has been training him. When buying from the transfermarket, I usually go for a ratio of 1/40. For example, with a MV of 2M, the wage shall not be higher then 50k.