I just wrote a rather large reply to this & then lost it so hopefully I manage to remember everything again...
This is absolutely the kind of thing that should be accessible & transparent though.
I can only really speak for the time I've been involved in the Society, since early 2017, but when I joined the board, the club was still very early on in the "repay Les Hutchison's loans" journey. You may remember that, at the time, there was the Double Your Money campaign, where every penny raised by the Society would see Les cut his loan by the same amount. However, also part of the loan agreement, was that the Society would put - if memory serves - around £130,000 into the club on an annual basis (in the form of loans).
This effectively meant that, as a result of the Les Hutchison loans to the club, the model of the Well Society changed from being that contingency fund to investing in the club on a yearly basis.
Alongside that, there is also the reality that, albeit infrequently, there may be the odd situation where the majority shareholder is asked to invest a sum in the club for a genuinely important reason. The example I'd maybe use to flesh that out a little would be if there was an injury crisis in January & the playing budget was already maxed out, would an owner elsewhere be able to reduce the chances of relegation by increasing that budget slightly to cover a target? And if so, should the Society do likewise? As I say though, very much not a regular occurrence by any means.
Beyond that, in more recent years, there has been a process in place to allow parts of the club to apply to the Society for a sum of funding. The funding is capped & an application has to be submitted that details what the funding is for, what the benefit is, and why the funding can't be sourced elsewhere. The Society Board has to agree as a majority to accept any of those applications, and a number have been rejected during my time. Those that have been accepted are usually publicised at the time, the defibrillator outside the ground & a couple of youth teams travelling to Ireland to take part (and win) a cup competition spring to mind. The sums spent on successful applications are small in relation to the kinds of big sums we're talking about and even then, the Society Board would point blank refuse any application if the club itself was in any sort of financial trouble or it just wasn't viable or deemed as worthwhile.
And then there's the usual admin fees, other expenses, and the staff salary that the Society pays on an annual basis. I am not aware of any ongoing funding of or donations to the likes of the Community Trust, outwith any requests they've had regarding funding in the past that we've possibly agreed to.
That for me is a - albeit second attempt - rough outline of the Society's financial approach as I understand it. There's no doubt that the model of the Society switched during those years following Les Hutchison but, in more recent years, there's been a conscious effort to switch back to the original model, hence the ability to build up £750,000.
All that said, if you're looking for more specific figures, I would absolutely contact the Well Society by e-mail. None of this should be a secret.