Some folks in this thread need to understand formal logic. Saying that a player who has many guitar is a crappy player does not mean that a person who has one guitar is a good player -- he can still be a crappy player. This is the difference between 'if' and 'only if' statements.
I personally am of the camp that those with lots of guitars, who are not professional players (Rich Robinson and Slash can have as many guitars as they want) tend to be, on average, not so stellar as players. I say this as the owner of several guitars. I like buying guitars and playing and getting different sounds, but this is not playing guitar -- it's a slightly different hobby. It makes sense that the person who dedicates all his resources to playing the guitar will be a better player than the person whose resources are divided amongst playing, reading gear reviews, buying, selling, changing pickups, etc.
No way, I disagree. Knowing how to care for and set-up the instrument you use if pretty much PART of being a good player. If you don't know how to adjust action, how do you know what you prefer? If you don't have pickups that carry the spectrum of sound you want, how long can you continue practicing and NOT getting the sounds you're striving for?
Can people get caught up in the wrong details and lose track of developing as players? YES. But making the jump from that to considering it an IF=THEN type statement, you're nuts. I highly doubt the two are that closely linked or related. I know a LOT of guys who can't tune, change pickups, adjust action, intonate, change strings (yup, some people can't even do that), and own only one guitar. And guess what? Most of them are crappy guitarists with out of tune, flat, dull sounding guitars that are poorly intonated. And they practice rarely because of it.
The two are not really related. Some people focus and apply themselves, some don't. Some like the tech and gear aspect of the art. Some don't. The two are absolutely positively NOT RELATED IN ANY WAY AT ALL! There are some lazy guys who don't practice with 30 guitars who suck, and there are guys who had one guitar for 30 years who don't practice and ALSO suck. And vice versa, there are some damned good player (DAMNED GOOD - OP anyone?) with a whole ****************load of guitars who still work their ass off and practice.