how can some players make coverings with a horse and then geld it? (2)
Every player has their own reasons why they do things. You would need to PM the player and ask.
Gelding does give a comp bonus so maybe that's why. But again, each player would have their own reasons.
Generally, players geld horses to protect their breeding and high GP and to make comp skillers because the geld adds an extra bonus and sometimes players sell horses they don't need anymore but geld them so other players can't use them for breeding.