If Grimsby went on sale to members, briefly, it seems logical that Macclesfield would be about the same rate of sale, no? Both similar allocations, both long weeknight trips to places we rarely play... It's even the same gap since we last played them (17 seasons).
Macclesfield gets a small uptick because at least you can get home on a train the same night (very late), and a small downward tick because I suppose it will be easier to watch it on TV in pubs.. Macclesfield is the only TV game on Monday 16th whereas Grimsby may not have been on in many pubs outside of TW8.