I've got my NSCA-CPT certification but due to the economy, can't really find a job with it as of yet. From what I can tell, I've heard that at a lot of the bigger gyms there's a great deal of sales involved in the process.
In all reality, that's kind of how it should be, because, as trainers, we're selling ourselves and our knowledge in order to help others obtain their goals. That being said, however, I have known some other trainers at places like 24 Hour Fitness and Bally that, in addition to selling their own services, they're also required to sell company products such as supplements and nutritional things, and are regulated to sell through quotas. This also applies to "Training packages," I.E. 5 sessions for X# of dollars, ect.
This is one of the things that I think I honestly will either have to come to terms with if I ever work at one of those bigger gyms, or if I need to have one of those jobs. I honestly -loathe- sales, but in terms of training, that's fine. It's a clientele-based business and that's the nature of the beast. In terms of nutritional supplements and things though, that's not our job, and in terms of what most of those gyms actually sell, it's a load of sugar-laden crap anyways. If I'm selling something, I want to be able to actually say its a good product.
If I'm selling myself as a trainer, then I know I'm good at it, but if I'm hawking a bunch of ineffective placebo supplements, then I think that it's more of a question of integrity and reality. I simply don't believe in gouging people for their money if they've got nothing to gain from it.
In my honest opinion, beware of those gyms that are wanting to put you on a product sales quota. It's not your job, man. Gyms hire nutritionists and sales people for that. That way your conscience is clear, you don't have to question your own morality, and you can be sure that you're truly providing for the people you're trying to help.