I just checked this and i foun one site that said it is recommended to add a 0.0008 for normal confirmations. This comes down to around $0,80 per transaction. This means that for small payments this is a ridiculous fee that even tops Gaypal.
That is why for small dust transactions we need 2nd layers solution to not divide main network.
It is impossible to run everything on main chain. Bitcoin got to popular. Eth have 1/3 transactions but they network is heavily rissing.
It will choke or blow up nodes hard disks.