WHAT? Maybe if you're at the upper end of the advanced spectrum and have to diet down for multiple competitions a year...
Why don't such people just take up sewing?
If I were gaining 5 lbs a year... Wow, It'd take me 5 years to add 25 pounds... And that while doing 200+ hardcore workouts a year... I'd just do something else... What a waste of time.
Here's a hint: If you use "I'm natural" as an excuse for why you fail at bodybuilding, then this sport is not for you.
If you actually tell everyone that you're natural before they even ask, then this sport is also not for you.
That lack of progress has nothing to do with being a natty. It's the same issue that young 180-210 pound guys who use every exotic substance on the planet have.
What ridiculously low strength-for-reps gains does someone make who only gains 5 measly pounds of muscle a year?