We're thinking about it, but there are a few things to take into consideration.
The biggest issue is that people can own multiple products - does this mean we charge them multiple times?
If not, then potentially someone could own tens of our products, but only have to pay 1 small fee for unbranding.
With this in mind, what do we charge for this? If it's a small charge then it hardly becomes worth our while - we can off discounts etc to customers because the branding provides advertisement for our products, which offsets our marketing costs, if a lot of customers go branding free, that increases our costs elsewhere, and forces us to stop offering discounts/raise prices.
On the other hand, if we charge a *large* fee for unbranding, then customers who only own one product are paying a large sum for the privelage - and worse, people might see it as us being greedy.
lots to consider =)