It's impossible to avoid scratching it, as the curry cooking technique involves much stirring and scraping with your chef's spoon.
With the greatest respect, it is not impossible ! All you have to do is to use the same soft utensils as you would use with a Teflon(R)-coated pan : nylon or wood. Even though I have now ceased to use Teflon(R)-coated pans, I continue to use the same utensils as I always did. The benefits are two-fold : far less clatter when cooking, and an unscratched pan 
** Phil.
You are of course correct Phil. I should have clarified that it's impossible if you use a
metal chef's spoon.
Personally, I love the clattering (though I accept that others in the house may not share this love), and while I'd obviously use a wood or nylon utensil if using non-stick, I find that nothing beats a stainless steel chef's spoon for scraping off all the glorious goo that adheres to the sides and base of the pan. (Though you don't get so much of this on the sides when cooking on an electric hob.)
Aesthetics aside, I don't
think the scratching caused by spoon action mars the pan's performance in any way. I could be wrong, but it's not something that seems to trouble BIR chefs. Some of their pans look like they've taken direct mortar hits!
I guess it's a personal thing. I like cooking kit that's seen some service and has 'bedded in' nicely. (I've always secretly coveted Chewy's battered 12 year-old pan:
Madras on Vimeo)