I don't think I'm being unreasonable but maybe I'm wrong. I've name changed to venture into this part of the forum, partly because you can be a bit brutal and also this will identify me if my friends are on MN ...
I'm a keen runner, belong to a running club, do several races a year. A friend has never really run but is quite sporty and athletic. On the spur of the moment she decided to do a half marathon, did a couple of weeks training and successfully ran it - all great so far.
She decided just beforehand to do it for charity and asked me several times to sponsor her which I promised I would do. Being somebody who socialises with a lot of runners, it wasn't surprising that I knew eight other people doing the same race. Four of them were also doing it for charity, and by coincidence, three were doing it for the same charity (I wasn't running it as I had done one the week before - I've never run mine for charity as it's a hobby not a special endeavour for me).
I spoke to DH and we agreed we wanted to sponsor all our friends so decided to sponsor each one £5. So we were contributing £20 to one charity and £5 to another. We had also sponsored a few people doing the London marathon and it's all getting expensive. While we don't struggle, finances are pretty tight to the wire each month. We both work but childcare cripples what we bring home each month and we aren't high earners.
Anyway, my friend hasn't really spoken to me since doing her race and hadn't replied to a few texts. I asked a mutual friend in passing if she had seen her recently and she said that she had but knew she was a bit upset with me for only sponsoring her £5!
I sent her an email after I heard this and said great job on the race, you did really well and should be really proud of yourself for raising a good amount for charity. Sorry we couldn't contribute more but we were also sponsoring quite a few others in the same race and wanted to support all our friends equally rather than just one person a larger amount.
She replied and said it was okay but she was a bit upset as £5 doesn't go very far and it sends a message to others that it is okay to donate a low amount and for future reference it is better to donate anonymously and keep the amount hidden when it is less than £10.
I feel pretty put out and wish I hadn't bothered to sponsor her at all. DH says forget it, move on and don't sponsor her again but it is making me worried about sponsoring others - is £10 really considered the done minimum now?