Oh horse hockey! Professional recordings most certainly do have have noise! They're just better at hiding it. Masking, muting, gating, filtering, or whatever it takes. Every damn thing makes noise and there's absolutely no way around it in the really real world. Even with completely ITB, totally synthetic, computer generated music you'll still have dither/denormal noise to deal with.
Yes, pro gear - installed properly and correctly in a generally low noise environment - might be even a lot better for S/N than a budget setup in a basement with flourescent lights, a furnace, and a chest freezer, but there is no place in the known universe completely free of noise.