I don't think you're ridiculous. We went with ds when dd was a newborn, and I enjoyed it, but there was no way I was ever going to buy him Gymbo, that's for sure. And I was always a little put off by the "This week all our XXX is on sale!" la-dee-dah stuff. But I also figured, that's their business, it doesn't mean I have to partake.

And I could also see then that the teacher made all the difference. There were some I avoided (one of the owners in particular) and others I loved. Plus, ds grew out of the equipment in the space of about 6 months. Then we discovered
My Gym and we love it so. We've never looked back since. There's still commercialism (it's a business after all), but everyone enjoys it more. Funnily, the other day ds said to dd (who has never really been to Gymboree, and I didn't even think he remembered Gymboree to tell the truth), "See? Isn't this better than Gymboree?"

But, different things work for different people, and boy, Gymboree served it's purpose for us at the time we attended.
