Rates in the thousands display a comma and cannot be saved back

Steps to reproduce:

1. Create a Red Hat OpenShift Container Platform cost model
2. In the Price list screen, add a rate, eg node cost = 1000 USD/month (type exactly "1000", no comma, dot or anything else)
3. Save cost model
4. Edit the node rate in the cost model: it shows "1,000"
5. Don't change anything, just click on Save. An error is shown and the cost model cannot be saved until you remove the comma that we gifted the user with.

Suggested fixes:

a) Don't introduce a comma

b) Know how to handle commas

Either of those would work for me.