Until 2012 you were able to raid and have all slots with BIS items by slaying Avatars. It costs me round about 13 eur monthly and has a really nice performing char which at the end of the addon easily can do heroics solo without merc, without a mount and without a familiar. Nowadays you must buy the 115 eur premium edition, 13 eur monthly and 200eur monthly ( minimum 6 month) for crates/familiar and infuser to reach on top. And you must hope that no new season familiar is comming at the second half of the addon, becasue it would cost additional 600 eur to boost at lvl10. I know, you can reach this maybe with some bonus weeks, overseer luck and many time of waiting of researching but top player want to play and performing well now and not in 10 month of waiting.