KOTH Starters - list the 15-player requirement in the petalshop

According to the forums post, 15 or more players must be online to use a KOTH Starter. More often than not, there are less than 15 players online on SMP. I don't think it's super rare, but for players in certain timezones, I would guess it's very rare to see 15+ players online. In that case, you would be waiting weeks/months to use the KOTH Starter. Given that's the case, I think the 15-player requirement should be listed in the petalshop.