All different types of discounts are available and that includes exactly how many times you travel with them and when. Not difficult to find out………email, phone or write…….they always give the best deal available.

You will receive a magazine from them giving special offers for past members. It is not a fixed percent for all cruises. They offer certain dates with special prices or room upgrades.

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Royal Caribbean will offer a discount on future cruises if you join their anchor society (which is free) i am going on Freedom of the seas in August and got $30 off my cruise ticket. In your stateroom on the first night of the cruise you will find a welcome package that has discount coupons for things on the ship. At least, that's how Royal Caribbean works. This is my 5th cruise and i am loving it!

Yes, Carnival does i am not sure about Royal Caribbean. On Carnival you have to have sailed 10 times. Then you will be considered a VIP member and have special privileges.

Yes, they both offer past passenger fares.
(based on availability)

yes. they do.
but not much.
My best guess to you would to be to search this on google about 3 weeks before the cruise.

Carnival last minute cruise discounts

Those sites work wonders!

-hope i helped!