The program fee (which I think is what you are referring to) is $.73 per thousand points. On 300k points that should be $18.25 per month. If you’re getting hit with $50 extra per month, something is way off, however:
1. Your first months fees may be off because you are getting charged for 2 months depedning on the timing of the transfer AND;
2. If you don’t have autopayments enabled, there’s an additional monthly fee that’s somewhere in the neighborhood of $10-$12ish dollars per month I think.
Add all that up and you might be at $50 more than you thought for your first month, dropping down to $18.25 every additional month after you set up recurring payments.
Edit: As a resale purchaser you should be paying $.73 per thousand. However I’m resale and they’ve always coded me at the ”plus partners” rate which is $.75 per thousand. I haven’t bothered to try to fight this since the amount per year isn’t much, but it’s possible you’re also getting charged that higher rate, which would be $18.75 per month instead of $18.25 per month.