I agree it does seem a ludicrous dust price, most people I know arent really willing to pay it either.
Though with the announcement of the double catch dust event from the 18th to the 2nd, and all the star pieces in the Christmas box, I think we'll have dust to spare soon.
I'd consider buying charge moves for mewtwo (shadow ball ones), Kyogre and Groudon (*If I had one!*) at full price gladly. Giratina I would if the dust cost wasnt that high, the other 3 find usage for the second move outside PvP, while Giratina's use is exclusively PvP or pokedraft if you do those.