E. When you jump at the chance to buy that rare or desirable
tool at a good price, knowing you can sell or auction it at a
profit & use the proceeds to acquire that set of gouges or H&Rs
or plow or shoulder plane you need for that project you're
planning on starting any day now...

-----Original Message-----

Using:

A, B, C...

D. When, as a user, you gain that ripe old age when using
is a damn sight harder than it used to be, so you switch to
collecting to satisfy your need to hold the tools you used
to use.