Right , but setting parameters on what constitutes a sale is a simple thing to do , and Amazon obviously doesn ' t do it . There are plenty of rules and restrictions on how items are priced regularly , including both normal product listings , Kindle Direct Publishing , etc . <| sep |> Sorry for the long post . The TLDR is that ' s a very dangerous thing to do . Below is why I say that . Galatians 21621 16 Knowing that a man is not justified by the works of the law , but by the faith of Jesus Christ , even we have believed in Jesus Christ , that we might be justified by the faith of Christ , and not by the works of the law for by the works of the law shall no flesh be justified . 17 But if , while we seek to be justified by Christ , we ourselves also are found sinners , is therefore Christ the minister of sin ? God forbid . 18 For if I build again the things which I destroyed , I make myself a transgressor . 19 For I through the law am dead to the law , that I might live unto God . 20 I am crucified with Christ nevertheless I live yet not I , but Christ liveth in me and the life which I now live in the flesh I live by the faith of the Son of God , who loved me , and gave himself for me . 21 I do not frustrate the grace of God for if righteousness come by the law , then Christ is dead in vain . Ephesians 289 . 8 For by grace are ye saved through faith and that not of yourselves it is the gift of God 9 Not of works , lest any man should boast . So how are we saved ? By grace . What were we saved for ? Good works . But not by good works unto the law . The law was so you can identify sin and know you are sinful and need forgiven by grace . You can ' t keep the while law . You just can ' t . And James 210 tells us For whosoever shall keep the whole law , and yet offend in one point , he is guilty of all . This means to be justified by the law you would have to be perfect . And of you could be perfect you wouldn ' t need Jesus . Galatians 216 16 Knowing that a man is not justified by the works of the law , but by the faith of Jesus Christ , even we have believed in Jesus Christ , that we might be justified by the faith of Christ , and not by the works of the law for by the works of the law shall no flesh be justified . Why ? Because the law is to convict . The law kills . The spirit brings life . 2 Corinthians 3518 emphasis mine 5 . but our sufficiency is of God 6 Who also hath made us able ministers of the new testament not of the letter , but of the spirit for the letter killeth , but the spirit giveth life . 7 But if the ministration of death , written and engraven in stones , was glorious , so that the children of Israel could not stedfastly behold the face of Moses for the glory of his countenance which glory was to be done away 8 How shall not the ministration of the spirit be rather glorious ? 9 For if the ministration of condemnation be glory , much more doth the ministration of righteousness exceed in glory . 10 For even that which was made glorious had no glory in this respect , by reason of the glory that excelleth . 11 For if that which is done away was glorious , much more that which remaineth is glorious . 12 Seeing then that we have such hope , we use great plainness of speech 13 And not as Moses , which put a vail over his face , that the children of Israel could not stedfastly look to the end of that which is abolished 14 But their minds were blinded for until this day remaineth the same vail untaken away in the reading of the old testament which vail is done away in Christ . 15 But even unto this day , when Moses is read , the vail is upon their heart . 16 Nevertheless when it shall turn to the Lord , the vail shall be taken away . 17 Now the Lord is that Spirit and where the Spirit of the Lord is , there is liberty . 18 But we all , with open face beholding as in a glass the glory of the Lord , are changed into the same image from glory to glory , even as by the Spirit of the Lord .