I am going to keep it simple and relatively brief but here goes:-

1) The vast choice in watches.
There seems a significant amount of case shapes,styles and colours to choose from, can quite easily have half a dozen or so completely different watches but all Heuer

2) The relative cost of this Hobby/Obsession.
I am a working man, I do alright but do not earn bucket loads of cash, but the cost of heuers means I can buy them occasionally without going without- family and home first-watches second

3) The people.
This forum in particular makes me feel comfortable in being able to persue this hobby without being ripped off.There is invaluable information here from the On the Dash section, and also the members who all seem more than happy to help.

Simples