I don’t doubt there are benefits regarding load balancing and redudancy (I’m not going to pretend to know what those terms mean…). I was not aware of a “Secured by NitroSell” badge, and that is (IMO) a step in the right direction!
True, I am not familiar with the OP’s particular situation (as I have not seen their site). The studies I was referencing are definately dated somewhat, but the general idea is covered here:
Cart Abandonment Study - If you scroll down to the surveys section - Question 5, you will see mention of the address bar and SSL certificates. It claims that ~75% of 126 participants pay attention to the https status in the URL address bar in browsers.
Also, notice the fact that a few reputable companies’ badges are included in the study, but they do not perform too well. Comodo (coincidentally listed as the “Verified by:” of the NitroSell Certificate) and their badge tested poorly. This means nothing obviously (two different things (badges/certs). I suppose what I am getting at is that (apparently) there are some benefits to having certain badges (PayPal, McAfee, Norton).
More Statistics (Not sure how reputable this one is but regardless…)
Here is a case study regarding Overstock.com and their use of SSL certificates…
Verisign Case Study
I admit, this is not my specialty, but I do personally feel that (even if the gains are minor) having trust badges are beneficial, and that having an SSL certificate (that is owned by our company) along with the green address bar can affect conversions.
EDIT: I believe you (that it isn’t in high demand)!