Sounds more like OCD than ADD, but I'm sure without a lot of trouble we could find several other mental disorder-related acronyms to apply in order to justify/explain our behaviour <grin>
Patience. If you pay a lot of attention to guitars, it becomes a "thing" about you and all your friends/family/co-workers know about it. Every once in a while, an incredible deal will come along and if you don't see it yourself, somebody else may and you'll get the chance to improve your lot. There's an old saying from Louis Pasteur: "Chance favors the prepared".
Chance, luck... same thing, really. In any event, it's very true. If you go looking for a specific thing today and can't wait, you're screwed. You gonna get hurt. But, put yourself in position by saving up the money, and there's no panic. Then when fortune smiles upon you in the form of a '58 Tele the kid down the street found under grandpa's bed after he died and he wants to know if you think it's worth $50, you say "It depends. It's awfully old. But, I'll give $75 RFN."
Then you smile at the sky and call it "luck". But, really, it was you being prepared. Shithappens all the time.