I personally can afford to strike and will do so if my union has a vote in favour of it. I'm in a fortunate financial position these days. I'll still have to make up the work afterwards, as would any other support staff that aren't employed solely there for the here and now. The financial circumstances of the vast majority of support staff are not anywhere near as good as mine. Just as mine weren't when working in the NHS as a lone parent with the grand sum of £37 over the bills coming in each month.
There will also be knock on effects for agency staff who won't be working that day due to closures, any cleaning staff who are on ZHCs, lunchtime supervisors on ZHCs, kitchen staff employed by private contractors, people who did not get TUPEd out on Green Book T&Cs but are on Academy contracts...
Whilst a teacher may be losing a larger sum of money in respect of what they would have earned in work for that day, the salary received on the other days of the month is significantly higher, which gives them the financial wriggle room that a huge proportion of support staff simply do not have. After all, if somebody on Main Scale is losing £100 or more for a day's strike (and if the NEU doesn't apply sustension, which they don't tend to do for national levels of action), they've still got well over two grand coming in that month; if somebody is on next to sod all in the first place due to being support, they don't have that financial space to do it. And they are also more precariously employed in the first place, even under NJC terms.
'For teachers, the Burgundy Book (Section 3, Paragraph 3.2) states that the pay deduction for a day of 'unauthorised absence (e.g. strikes)' should be 1/365th of annual salary. However, for Green Book-covered staff, employers can make deductions on the basis of 1/5 of a week's pay per day spent on strike (for full-time employees). This is the equivalent of 1/260th of a year's pay, and is based on the High Court decision in Cooper & others v The Isle of Wight College (2007).' So they also lose a greater proportion of their salary for striking, even with the broadly better T&Cs provided for under the Green Book.
(By the way, a teacher on a fixed term contract also still has the benefit of continuous service under the terms of the STPCD 'A person has completed a “year of employment” if: a) the person has completed periods of employment amounting to at least twenty-six weeks in aggregate within the previous school year', so they benefit from this hugely compared to somebody whose length of service starts at the point at which they join a particular academy).
Being 'all in it together' ignores the disproportionate effect such action would have upon a huge number of women. If they do vote for and then strike, they are risking more than the majority of teachers and this should be appreciated by teaching staff. And if they don't, then it should be remembered that they have made their decision from a considerably weaker position financially than the majority of teachers.
Equity, not equality is the key to understanding the differences.