User blog comment:Fistful of Force/Avarice seals aren't worth it./@comment-89.75.167.175-20120822131733

The reason why you get GP10 runes and masteries is not necessarily to actually have them substitute farming.

The reason why you get them is to be able to afford GP10 items as soon as possible.

If the enemies are dumb and let you get fed on assists, no problem. But if the enemies are good and don't give you assist gold, the typical route is as follows:

No/Few GP10 runes and masteries: You get Faerie charm and 3 wards, go to lane, do some supportin' -> a couple of minutes later your wards wear off -> you go to base -> you can't afford wards AND philo, you get wards and leave some for the philo -> you go to lane do some more supporting, but you're still in the same situation. You have your starting items and nothing more, your gold income is not greater by any means. Your usefulness falls every minute the enemy AD carry farms and you have no way to get more money for gear.

With sufficient GP10 runes and masteries: You get Faerie charm and 3 wards, go to lane, do some supportin' -> a couple of minutes later your wards wear off -> you go to base -> you can afford wards AND philo, so you get both -> you go to lane do some more supporting, but this time your gold income is much greater. On your next trip back you will ba able to afford a heart of gold and the rest of the game will go smoothly.