Let me ask you this:
Would you purchase a carpenters lumber?
How about an electricians wire?
Maybe a plumbers piping?
If you answered no to any of these then why would you buy a painters paint?
Painters usually have a "go to" paint that they work with a lot. One that they know and trust will give the results that they look for in a finished product. One that has a flow and consistency that they are used to and enhances their effeciency.
Asking a painter to use something outside of their comfort zone and...