Look, the price of kibudim can’t matter much. If one is rich, then the money is nothing to him. If one is poor, he can’t afford it anyway, so obviously the RBSH considers it as if he bought it, as long as he had it in his heart to do so.
As far as auctioning things for blatt gemara, I am totally opposed, as there is never any way to verify that someone kept his neder. Even a bechina won’t help, because maybe he knew those dapim beforehand.