£25 sounds a lot to me but then like you say, it's a piece of string question, dependent upon finances, how many you buy for etc.
Until this year, we didn't have any nieces or nephews between us but I now have a nephew. My brother already suggested not buying for adults on that side of my family (my dad's) which suits us. I've spent £15 on him on something that was reduced from £30 and I will spend another max £3 on a little book or something. Does anyone else fall in to the trap of 'one present doesn't look enough'? But I guess that's only as we have two children they will be buying for so don't want to look tight.
On my mum's side of the family, I have loads of younger cousins, considerably younger so have always bought for them. I do £10 limit but try to get it less if I can. Aiming for around £8 instead of £10 really makes a difference when you add it all up.
I can't believe the amount of presents we have to buy! I tried to make things easier this year as lots of you will understand the difficulties of trying to physically Christmas shop with two little ones! I did a Boots order and there were 21 items, all Christmas presents and only 3 for my children! On top of this, we have atleast 6 other presents to buy.
Anyway, as an aside, how much do you spend on you own/OH or have there been threads on that?