Dear Cautiously Concerned
Let's pretend you want to buy a Harley Davidson Softail Heritage Classic. You have wanted one ever since you were a kid and your Uncle pulled his up on your parent's driveway for the first time. Now you stop by the dealership twice weekly; you have your favorite color picked out, and all the extra's to go along with the style you desire. You can envision the day when you pick up your motorcycle after waiting months for it to be finished, but what stands in the way of this dream being fulfilled is your wife's wish for the two of you putting enough money away to pay for it in full.
Let's also say that you finally get your Harley home after dreaming about it your entire life and after loving the idea of it, and it then sits in your garage for the next 8 years collecting dust because you forgot to ask your wife what it meant when she said it was okay if you bought it, and she doesn't want to go on rides with you.
I recognize that a Harley is not only an emotional investment, but a financial investment, so the two comparisons are not exactly the same. However, I would like to point out that the issues and conflict, as well as your fears and how you choose to handle them with your wife are rather the same.
How you handle your introduction to the Lifestyle with your wife is a very emotional process, full of honest discussion. In order for you to remain successful in and out of the lifestyle, my best advice is to fight your impulses of keeping your fears to yourself. Your wife is your partner, and by describing your concerns to her it will only draw the two of you closer. It might also add a new dimension to your relationship as a whole and further define her interests in the Lifestyle, which seem rather vague up until now (as do yours).
It sounds to me like the two of you need a better "Game Plan". As with any big decision that the two of you make together, you will feel much better if you are both on the same page, holding hands the entire way through. You both seem to be fumbling around in the dark until something grabs you. You both need to be holding the flashlight together.
As far as it being okay for you to call it quits when you have reached a critical limit, albeit far from me to judge, but I believe the love your wife has for you will always come before any relationship she ever will have outside of the one with you.