buying tier is a one time buy or each month/year

ok so i rly wanna buy some tier rank but..... its not telling anywhere if its a one tiem buy or if i will have to pay every month..... can someone answer me plz thx

 

The rank is permanent you will only have to buy it 1 time and its server wide

 

It is only a one time payment for a tier rank. There's also a cool feature that if you are wanting to go up a rank you only pay the difference between the two ranks!

 

make it a whole page so people have to read it