Obviously; the optimal bet spread for the Revere Point Count - or any other counting system, for that matter - is zero to infinity. In the REAL world, you'll last about 15 minutes doing it this way.
If you're asking what kind of a spread is recommended; that's another story. It will depend upon the rules, penetration, whether or not it's single OR double deck, your BR, your personal preferences, your act, the sweatiness of the house, etc.; etc. In other words, this is something that you're pretty much going to have to figure
out for yourself.
For a single deck game with decent rules and good penetration (if you can somehow find one); a one to two spread will pretty much yield a break-even game. For double deck; three to one is break even. Anything you can get away with above these benchmarks is going to be "real-world optimal". This is where the "cat & mouse" game comes in. The better you are at it, the more successful you'll be. Good luck!