It's considered the "easiest" to buy because when you attempt to decide which skills are easiest to buy, you assume an infinite amount of money. Assuming that infinite amount of money, it's quite possible to buy 99 construction in about a day or two. Obviously you've never trained construction before... 10k oak logs from lv50-lv70 took me 5 days playing 3 hours a day. That's 15 hours. It takes 200k oaks to get from 70-99 Lets say every 10k logs equals about 15 hours So basicaly from lv 70-99 that would take roughly about 300 hours and last time I checked there's oly 24 hours in a day. Even if you waste almost twice the money to use mahogany logs it would still take a rough 150-200hours of pure work. So exactly what is your construction level?