My self control ends at being completely happy with my spouse. Bikes have too many roles to play in order to have just one.

Certain rides beg for a jaunty C&V bike, whereas sometimes I just want to hammer. Mountain biking is a whole other thing as well. Even gravel roads prefer a different type of bike (I know that's getting kinda over the top, but I don't have a cross bike or I would just use whatever that was). Then there's the bike with racks that can haul adult beverages home.

Why, because I can. It has gotten to the point, in the past, where it becomes too much. Then I cull the herd and wind up building nicer bikes to fill the same roles. Winters are long, and having a project really helps keep the enthusiasm right out of the gate when the weather improves.

I have one that's the top of the pile, but when it needed repair I was happy to have another really nice road bike to use.