Actually, we do.
As pointed out in Mine for U+1F421 BLOWFISH is shown above.
I have been quite lonely as the sole Silver sponsor, but I am very pleased to report that Alexander Falk has recently joined me by sponsoring U+003C< LESS-THAN SIGN at the same level.
I am also very pleased that my employer, Adobe, has adopted U+0026 & AMPERSAND at the Gold level.
Keep those sponsorships coming! Especially Silver ones.
It's for a good cause, and you'll get a nifty digital badge.
Edited on 2016-04-20to add that effective 2016-04-18 all character adoptions are permanent.