Ah, but I have that attachment disorder ... acquiring is one thing ... letting go is another.
For example, I picked up a cracking bakelite boxed Valet, all in, all perfect, strop too ... and the razor polished up to beautiful. I bought it cheap knowing I could get it up to pristine and pass it on for a little profit, but can I part with it? Not likely!
But yeah, pick a theme and have some fun ...
I started out with Gillette ball ends. I picked up a small number and then the theme grew until I had one from each decade they were available ... then I filled in the options, different stamped heads, markets, variants ... and then the curveball hit ... some razor I did not mean to collect, but sparked another interest. Both DEs and SEs are fun to collect. They are relatively cheap compared to other hobbies, something between £5 and £10 a razor, £10-£25 for a boxed version, more for those desirable models if they float your boat ...
It's a cheap enough hobby.
... but as Vinny said, if you spend longer picking your gear than actually doing to do ... maybe you have a problem. Me? Nah! I just grab what speaks to me and get on with it. My shaves take about 10 minutes including collecting up my razor, blade, soap, brush and aftershave. Photography takes longer.
It might be prompted by a blade I have in action or just a desire to run through long combs or DDs or novel injectors, or something. With such a variety of scrapers, in all honesty, I can get a great shave out of pretty much anything, so it's entirely down to aesthetics for me for which I have a kind of synesthesia - the combinations just come to me. That, or you're seeing method in my madness ... randomness.