Knowing my demographic and being independent , I keep a flat rate because I know they'll want the upgrades the minute I lay my hands down and work, I've done several experiments with low intro the results are the same for me.
years have proved it.
Even if I have a special.
Not everyone can pull that off. If its a parlor low is the way to go.
it's the nature of them to have options to choose from
Why change it.