I haven't got a clue to what a DP rifle is worth, even if it's a NZmarked one but I'm a firm believer that there is a place in ANY Enfield collection for a DP rifle. It is what it is/are what they are, a 'real' training aid. Although I'd prefer to see an L59 in a collection.
Now there's a thought......... Maybe someone ought to put an L59 on the auction, see what it fetches then reproduce some more (simplicity itself.......) converted/culled from old worthless ex sporters. If I was living in the US noiw and had access to some of this old sporterised tat, this is what I'd be doing