> Better still, posting a link to an example of a prior product would
> be useful. Or several. Plus, telling us what the product is. I'm sure
> you could trust everyone here to not rush out and beat you to the
> punch. If this makes one feel a little uncertain and wanting to keep
> the information from the list then one may have some idea of how
> the NDA issuer also feels

Well, duh

> There are zillions of products in the world that are crying out
> to be made, or remade or invented anew in some better way.
> Why is the one that the client brought to attention suddenly the 
> preferred one ?

Because I've got it market-ready and the client isn't taking it to
market ? That's the whole point

> Did the client in fact add something which has sponsored this
> interest?

No

> Did they add even perhaps just perspective, a clue to potential,
> a new enthusiasm for an old idea?

No

> Given the sudden enthusiasm for THIS product over any of the
> other zillion products that could be made, might they not have
> some justification for feeling miffed that THIS is the one that has
> suddenly been chosen as randomly good to work on ?

I don't make the client's business decisions
 
> Does the client want to not proceed because they have found
> another developer who offered a better price or better terms etc?

No

> Might not the whole idea of the NDA have been to have the
> ability to discuss the idea with several developers to seek a
> price without having them decide to do it themselves? - ie more
> like the "restraint of trade" that someone suggested rather than
> an NDA per se

I sincerely believe there is nothing Machievellian going on. The
client just doesn't want to do it anymore

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