well, i too have hundreds or possibly even thousands of piano concertos, and sometimes i think it is a bad thing to explore as much as i do. as i delve further and further into the infinite world of piano concertos, i forget the popular classics, such as those by chopin, beethoven, and rachmaninoff, which i will always love. then when i go back to them and listen to them, i experience a similar effect. however, i experience this effect with pretty much all other piano concertos, or even solo piano pieces, that i have neglected for a long time. i do respect chopin's piano concertos for what they are and their musicality, but theres more out there than just beethoven, chopin, mozart, liszt, rachmaninoff, etc.