Fast, cheap, no charges back, can't steel info from merchants, you own it, privacity to the limit you want... what else...?
yeah there are no administrative costs for storage in bitcoin unlike in the bank you will be given tax and administration of each month. so if you want to save a lot of money you can use bitcoin
I don't think save a lot of money in bitcoin is the best safe way because bitcoin prices change frequently. If the price go down it will be bad for your money