Bay Photo not available for Power users
This is a suggestion.
I have a power not pro subscription. I do not print a lot, but when I do it is often large prints. In the last 6 months or so I have done about $1200 worth of prints from Bay Photo. I love them.
Only one of those was even available (in that size/type) from Smugmug in my subscription.
I wonder how many people like me, with non-pro subscriptions, might be giving Smugmug a bit of business if we were not limited to Ezprint? (I'm assuming that's who you use for us, it's been years since I did something with them).
I really can't understand the difference -- it's not like it provides a functional feature difference in power vs. pro - one can just go directly to the alternate vendors without any real trouble. The real function difference is selling at a markup, price lists, etc.
This is not high on the list of things I care about personally. To be fair since I've gone direct so long I would likely not switch now. But as I just got another gorgeous Bay gallery wrap, it occurred to me to check whether I could have bought it on Smugmug -- nope. It was 30x45, you stop at 30x40.
Just something for you to consider, whether you are really providing product distinction, or just shooting yourselves in the foot.