Folks, there's so much cynicism here. If you want to learn and invest in yourself, do it! If you want to sit back and wait for your employer to invest in you, don't be surprised when it doesn't happen. Orgs need to make smart investment decisions. If you're not feeling supported it may be that the org doesn't view you as HiPo and that's clear feedback on your current value to the organization.
The problem with your argument is: what if the organization doesn't support anyone in learning? (Just like 99% of companies and society in large) Would you say then that you are a low performer? Because based on your argument that's the only logical conclusion.
You seem to have jumped to a conclusion but I don't think this has anything to do with being high performer or not.