It is very expensive

. Got sucked into the very 1st one back in May 2002.
Now we just go on normal cruises, we found that we are not like those

people

, sorry, but they would have rather lined up at the giftshops then enjoy the deck party, so wrong

.
We love our pins and enjoy the art of pin trading and all, but not that much, lol
Ok for better information,
It is a normal crusie with the addition of special events, to which, you purchase an event ticket before hand. There are a limited amount so check with disney. There are extra special pins and sometime chances to get free ones. Also they have had Disney artists on board to talk about pins and the designing of them, I think.
There are tonnes of people willing and looking to trade and they generally have pins from all over the world, I got some from DLT and DLP as well as some from special events at WDW. They came with bags, crates and suitcases full of pins.
Each cruise has had a theme, Ours was Ever WONDER where the MAGIC came from, or something along that line.
There were several special pins including:
a 250 LE, ship in a bottle pin, we have two of them

a 750 Artist pin, donald, we have 2 of these and traded 2 away.
Both of the above were given out by ramdon draw.
several at the 1500 - 2500 LE pins
there was also a collection card that has completer pins to purchase. It was the gang working on the ship, very cute.