Loosifah.4738

It's not really gambling as you are guaranteed to get a skin that you don't already have. The chances of getting the one you want are pretty slim; but it's just like black lion boxes(only you actually have 100% chance to get a skin)

https://www.reddit.com/r/Guildwars2/comments/7berpz/gemstore_black_lion_stables_mount_skins/

What do you have against mount skins?