We have got quite close to our daughter-in-law's family in Brasil and send birthday and Christmas cards to them. It's not a tradition in Brasil so I think it's quite a nice novel concept for them.
But, over the years the cost has increased a lot. We bought a job-lot of £1.80 stamps a while back but then had to add stamps when it went up to £2.20. then last year we had to buy a job-lot of £2.80 stamps but now, with summer birthdays coming up, we have had to add a second class stamp to the £2.80 to bring it up to £3.20!
No wonder Brazilians don't send cards!