Are there any industry stats or reports on the right proportion of Sales & Customer Handling staff VS other staff roles? Is there an ideal percentage?
That varies wildly based on sales cycle and product complexity. An easy rule: sales staff should be as much as you can hire and keep costs under revenue. Support should be enough that customer response times are never over 24 hours. If it's taking longer, hire more support if you can afford to.
If you can't afford to, you probably need to simplify your product or else improve your sales processes. 😊