Am i sinful if i consider the nisab to be the bigger sum(from gold and silver) ie about 3000$? Where i live the standard of living is so high that havibg 300 is considered really poor and it dpesnt even suffice to pay rent if one was on a lease.
This is not permissible.
The threshold (nisab) of money is the value of 595 grams of silver which is about 300$. You try and set a date and on that day, you calculate how much you have and give 2.5% in zakat. Every lunar year, you do this process on that date.