is the oil used to cook bhajis in worth adding to curry?
Personally I don't think so.
There's no doubting that a good bhaji oil has immense depth of flavour and a beautiful aroma but, in my experience at least, when added at the cury cooking stage it just loses its potency.
I suppose it adds something, no actually I know it adds something, but not the last few percent that I thought it would when I first tried it (many years ago now).
Having said that I'm left wondering if it's similar to MSG in that some people swear by it but for me, no matter how much I use, it makes bugger all difference to the flavour of Chinese cooking.