Best razors/most used or vice a versa

I've noticed that my best shavers are the ones with the thinnest spines, which might make them a little sharper. Then again I might be shaving more with my best razors, and making the spines thinner as a result. MMMMMMM

Additionally, does anyone with experience using one razor for a few years find they get better as they age?

I find once honed they tend to improve a tad after a few shaves but none of my razors have shown any real long term improvement.