Do you have to pay money if you have the disk for World of Warcraft

Well, there are 4 expansions for World of Warcraft, they all cost between
£9.99 - £24.99 but you have to buy the expansion World of Warcraft, and to get the 2nd one world of Warcraft the Burning Crusade you need to get the first one. So to get the second one you need the 1st one, to get the 3rd one you need the 2nd one and for the final one you need to have downloaded the 3rd one. Buying all the disks will cost £50 then you need to pay £10 a month to play monthly. BUT TRUST ME, ITS WORTH IT!