Never used lube, always go in dry.
As far as multiple boards, I've only had one board and I sent it back already because I wanted to try something else.
It's like any other enthusiast item, you want to make all kinds of crazy unique things.
Personally, I love building computers. If I had unlimited money I would built the smallest computer I could, the larger computer I could, the one with the most green colored hardware, something built around a specific unique case.
I;m alreayd starting a collection of video game keycaps, maybe eventually I'll put together an all video game board, as well as an all metal board, then the smallest, quietest, stealthiest board I can find. Some people just buy Model M after Model M and collect them, but putting them together is the best part in my opinion.
I think it was Ripster that said "you cant build the perfect board and you will go broke trying", or something.