I think you should get an achievement for becoming an Osu! Supporter 
And/or have Levels E.G.
Supporter Mark I - Became an Osu! Supporter!
Supporter Mark II - Brought 5 or More Osu! Support Ranks for themselves
or Gifting Awards:
Gifter Mark I - Brought an Osu! Supporting Rank for someone
Gifter Mark II - Brought 5 or More Osu! Supporter ranks for someone else!
and so on
<3
And/or have Levels E.G.
Supporter Mark I - Became an Osu! Supporter!
Supporter Mark II - Brought 5 or More Osu! Support Ranks for themselves
or Gifting Awards:
Gifter Mark I - Brought an Osu! Supporting Rank for someone
Gifter Mark II - Brought 5 or More Osu! Supporter ranks for someone else!
and so on
<3