I got BSD first and within a couple months I had a TOM. Then that got traded for a LOTR. Then over the next couple years I added a TOTAN, CONGO, STTNG and a TS. I had 6 at my highest point. And many were older games not in great condition and it became tough for me to keep them all playing. So I slowly sold and traded down to 3 newer Sterns which are MET, IMVE and AC/DC Prem.
They have zero issues and I can just enjoy playing them. I think I would get bored with only 1 pin though. At least 2 pins will keep it from getting repetitive right away. Even with 3 pins I am at a point where it's time to trade something out and try something new.