What is your sweet spot for product pricing?

Many in the IH community are successful entrepreneurs. So, my question to them is what pricing plan is most popular among your customers?

My guess would be $5 or $10 per month. I understand that it varies from product to product depending on the value that the user gets out of it. But, do they upgrade from $5 to $10 or straight away signup for $10?

Also, I am interested in general public opinion as a consumer what amount is a no-brainer for you?

Note: Please use the poll for actual data (from customers) and comments for general opinion (as a consumer). Thank you!