Ning Hai is a ship that was requested. Some people will pick her up for collector value, or for historic value.
As for the lower tier play, that isn't everyone's bag but it is nice if you feel like a little something different.
It's not uncommon phrasing at all. This was from a quick Google search:
As a person whose heard this style of advertising as far back as I can remember, there isn't anything that stands out to me about this language.
This is from the website you linked:
If you bought 12,500 Doubloons or more in the last two days, it can't hurt to send in a Customer Support Ticket!
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