If it makes you feel any better, none of those things give the player an actual advantage over another player. The Gold membership just allows them to level up faster on top of a few other lesser perks, and the custom crap is custom in name only. The infinite ammo isn't so bad, since a couple of good looting runs could earn you enough cash to buy a veritable boatload of bullets. I'm just glad Adminpwn hasn't seen it appropriate to sell stat boosters in the credit shop.
Although, the new Amputator annoys me the most by far. It's almost as if the Dusk Razor had been slightly nerfed, and put up for sale to anyone with a credit card. Credit-only items that are superior to the best lootable items should not exist. A GC'd sabre would have been a great deal more appropriate.
But... I'm sure I'll get over it when I finally get my dusk razor.
*Waits*