Big Front Seat is the best deal in US aviation. It's literally just a domestic first seat. No service, no food, no drinks. So basically the same as a domestic first class seat on a legacy airline. The only difference is it's a $20-100 add-on instead of a 2X-10X fare delta :) consider it next time! Spirit sucks in general, sure, but BFS is a hell of a deal.
I think your statement has merit whichever way it was interpreted, fwiw.
For the record, I did mean to make it $X-10 or $X-20, not to make it $10 or $20 in total, but I agree that it was awkwardly worded.