No.
This happens when same server teams do up selling. They are at one level above the others and sell the player to a team one level above it. Then this team sells him to another team one level above it. This process continues till the player reaches the main target team which is at highest level. So this way his greys remain 1%.

300% whites are due to earlier friendlies trick. Now it costs a lot of greens to get to 300%. But if the great exploiters have found a new method; then I know nothing about it.