Not the case at all I cleared most of Act 1 with a 600 DPS bow and blue quiver from Hell Act 4. With < 1 Mil spent I've cleared past Siegebreaker on my DH currently, only at 32k DPS after the IAS nerf. I didn't buy my current terrible 1017 (no dex) bow until Act 2.
If you can't do Inferno Act 1 hit up Hell Act 4 for a bit. If you can't do Inferno Act 2+ then farm Act 1 until you can. If neither of those sound fun go play HC or get another game.