I can't see spending over $100 on extended relitives... but then again this year I can't even spend that much on my own kids.
We do get a few "small" gift card (ususally $50) from some of our extened relitives - as a family gift (there are 7 of us in the house). Sadly we aren't always able to send a gift to them, but I do send out card to most relitives - it is all we can do right now... and even that we had to save up for this year.
Honestly, I don't see why you are spending what you are to begin with... if you feel the need to send a gift cut back and send a $25 gift card to each kids... then you will cut your yearly cost from around $5000 to under $1000, or send a $10 gift card and cut your cost to under $400.
Something else we do is an orderment exchange... but that is for family memeber still close to home (my mom, 2 sisters, 2 uncles, brother & grandma). Each year we buy a box or 2 of orderments we like & give eachother one. So, you end us with lots of different orderments... but it also cut down on the cost of Christmas since most of us are struggling a bit right now. We are able to give everyone something and it only cost us a max of $20 which cover 7 people... so just about $3.00 each or sometimes less if you get a good deal.
Another thing I do is, I get my sisters family a fresh fruit & mixed nuts... her kids love both, but do to the size of her family they don't get always get fresh fruit & stuff. So, they really enjoy it... honestly they sometimes enjoy the fruit more then anything else they get.
There is so many ways to say Merry Christmas with out breaking the bank... I hope you can find a way to say it and not feel like you were taken advantage of!