you are right, especially regarding vintage Rolex, once one steps into this trap...you're in dangerous waters!...we are talking not only serious money but these waters are far from being cristal clear!...
Balancing out passion with reason isn't always easy, but the good thing about the vintage world is you can achieve some great plaesure with reasonable money like the 7928, yet when you want to explore deeper depths, there is almot no limit as you know!...
Anyway, my way is clear, keep it enjoyable and have fun, don't let it become painful!...
I hope you'll be around some time in Paris, we can share watches and more around some nice food...
Matt