For what it's worth:
Having two bikes is really nice, IMO. BUT, only if they are different. (ie, high end road & low budget winter/rain... or race bike & WW bike... etc...)
I have had up to three different bikes at the same time (ALL QUALITY ROAD BIKES) that were all in teh same catagory (two were high end, but not super ww & one rainy bike, but still nice
I ended up not really riding two of them. In my experience you will always want to ride your favorite unless it is raining (how often does that happen..depends on where you live).
I endued up mainly riding one and the others sat around, it was nice, but I just lost $$$$ when I sold the ones I don't use and only got (at most) 50% of what I paid retail....
"In the end", ride what you want, but in my experience I enjoy riding my favorite bike with multiple wheelsets. (then just get a new favorite bike/frame every year or two
P.S. I do think two bikes is a great idea. When one is needing fixing etc.. you alway have another to ride.
I do plan on getting a second bike (again) but from this point forward each bike will be for a distinct purpose. (I have a race build and then I am getting a total WW build....again...
Best of luck.