RE: Being happy with what you have
I found that it took me awhile to find a bow that met my preferences and shooting style. Then a new generation of quieter bows with less vibration came out. I decided it was worth spending money on them and then a new cam style came out and I had to find out for myself if I'd prefer it.
Although all bows are inherently accurate, they are not all built for the same purpose. It can take a person years of experimenting to find out what they truely prefer. Sure, you could shoot the same bow for 30 years and only upgrade when a problem can't be repaired, and still kill every deer you shoot at, and win every league you shoot in, but you might miss out on a more enjoyable shooting experience.