I said, a month ago, that I will change the entire mount system.
completely. refund all and remove all mounts.
then.... I'll do the mount thing more like it should be: normally on kuchiyose base... e.g. you summon them and they help you until either defeated (0 hp) or certain rounds are over.
a replace for "mounts" will be "team mates" or "other shinobi".
=) I know the current system is not that balanced, but I won't change it now, think about it, then change again in 1-2 months...