you lose the power of the individual skill, your q is more useful than tho others early game, so maxing it will increase oyur power of farming, dealing damage and harrassing.Your W isn't used so much early game, so maxing it second for more mid game damage is a better choice.Your E just gains cdr and mediocre damage, there is no need to put more points in it.Also, rylai's sucks.As well as liandry's.Rylai's provides you a slow.The only thing in which it will help is chasing a stupid guy that you didn't kill for lack of damage, since you bought a rylai's.The hp won't help you from being bursted down in a teamfight and you can get the same amount of damage from a needlessly that costs less.Liandry's isn't good, you get a bit more ap and an active for 1415 gold.You won't proc that active so much and it isn't that useful since you have no slows,stuns,fears,snares.and the bonus 45 ap, you get from a blasting wand that costs 860 gold.I personally don't like HG, but if you want, keep it, just don't upgrade it.You also need a zhonyas, a dfg and a guardian angel in your build, they are way more cost efficient.

why do that??you increase the power of the skills you need for a better farm-kill...1st-2nd is primary,3rd is for aiming,i dont see the bad at my skill structure

Just max one skill...