People are talking up the numbers too much, surely the aim is to simply get more than attend the game in Northampton - talk of 20K is silly, and it will be a massive anti-climax if only 5000 turn up. Comparisons with the Dave Busst game (where over half the 23K crowd were United fans) and Celtic (where there were 5K away fans and the game was played at a time we were regularly getting over 20K) are not relevant.
Remember, a number of CIty fans will travel to Northampton, many are on holiday, there will be no away fans, and some will not go because of their feelings towards ACL. I don't know anyone who is going. Issuing press releases to SSN talking of numbers of 10K+ will only make it look like a failure when 3/4 of the ground is empty.