This is not all Newton Heath's fault... I draw your attention to FA Cup Rule 20c. Important bits bolded for ease of reference...
Immediately after the draw is known, the two Clubs concerned must mutually agree the prices of admission subject to the following conditions:
(i) Except where mutually agreed otherwise the minimum admission (except to children and senior citizens) to matches shall be:
In the Extra-Preliminary, Preliminary and First Round Qualifying: £3.00
In the Second and Third Rounds Qualifying: £5.00
In the Fourth Round Qualifying: £6.00 In the First and Second Round Proper: £10.00
In the Third, Fourth, Fifth and Sixth Round Proper: £15.00
(ii) A higher admission charge may be mutually agreed between the Clubs concerned. The Away Club’s spectators can only be charged more than the home team if agreed by both clubs.