That's an interesting question. I remember feeling that as a younger guy, and the corresponding "gotta-have-its" for a complete compliment of accessories to go with every gun, too.
Along the journey though my interest in firearms changed from collecting and "having" to competition and other "practical" uses like training and defensive practice. These days I have probably five or six firearms that I shoot "regularly" (meaning at least a few times a year), three or four of which get shot "heavily" in practice, competition, and training. Then I have the rest of the collection that pretty much just sits in the cabinets waiting for me to pull out and wipe down about once a year or less.
And while there are a few niches I don't really have filled yet (what, no AR-15? Hey, sometime I'll get around to it. Don't really need one right now...), I don't feel any pressure to do so. I can go to a gun show and not feel a strong desire to purchase any firearm I see there. (Probably why I've largely quit going.)
But I do have a pretty insatiable hunger for ammo components, match fees, course fees, and little bits and pieces of gear to help me run something better, faster, or more conveniently.
But, given $1,000 and told to spend it however...probably not buying a new gun.