This is par for the course for many companies that are on a sales-rep model.
The best inside sales ops do not allow this because when you do this at scale, you find out that customers will realize the true value of your product over time and if you significantly overcharged them at the time of signing up, you will lose trust, have trouble renewing and getting referrals. So grossly overcharging just because they are willing to pay is generally a poor business decision.
The fly-by-night operations are more likely to do what you are saying but fly-by-night ops aren't limited to sales-rep model.
The best inside sales ops do not allow this because when you do this at scale, you find out that customers will realize the true value of your product over time and if you significantly overcharged them at the time of signing up, you will lose trust, have trouble renewing and getting referrals. So grossly overcharging just because they are willing to pay is generally a poor business decision.
The fly-by-night operations are more likely to do what you are saying but fly-by-night ops aren't limited to sales-rep model.