I shoot at a public range and the percentage is well under 10% I suspect the percentage is higher at club ranges and I know it's higher at matches. Wild card is what percentage of gun owners actually shoot.
Finances are not the only motivator, if it were I wouldn't reload anymore. I just like repurposing wheelweights and figuring out how to make old leverguns shoot. And if it aggravates the guy on the next bench with his "sniper" or "assault" rifle when he can't shoot as well as me and my old levergun that's OK too.