Been meaning to ask this question on here for a while. Can you sell loyalty mechs? I've got two Centurion AH loyalty mechs that I earned during the first or second year anniversary events. I hardly use the second one and can use the mech bay for something else, but it doesn't display in the inventory list.
Any special versions of regular variants, (Collection, Phoenix, Resistance, Loyalty, Sarah, etc.) cannot be sold, because of their unique geometry/skin. This is a preventive measure so people won't sell off the mechs unknowingly I guess. Champion mechs can be sold because they're the regular variant, but pre-equipped with a community build. Hero mechs are not versions of the regular variants and thus can be sold as well.
They take the loyalty mech and the mechbay too I think, so there is no point in getting them to remove it, just use them as a place holder I guess.