Hey N.,
Even if they just want money...that's just the age they are in.
My nephew just turned 15...my brother isn't a big planner and he doesn't have a lot of mmoney because he lost his job a while back. He hasn't had a BP for our nephew in close to three years.
Our nephew lives with his mom...and the only time we see him is at birthday parties! So I rounded up our family and we surprised him BIG_TIME with a BP. My family wanted to see our nephew!
Yes we gave money. I remember being that age. I loved getting money.
He wasn't expecting anything. To see his face was just all the thanks enough.
I think it's a good idea...it's up to you. If you feel you need to change it up a bit...they might appreciate the money the next BP. Who knows. I know my nephew did...;-)
Best wishes!
J.