This year rather brutally taught me that lesson. Arcturus were playing here and I had nobody to go with. I tried to rationalise it: Garm sings on my favourite albums while their current singer was ICS Vortex (who I also like, but not as much), and I don't really know their new album. Then a few days after the gig, I learnt that ICS Vortex walked on stage and announced "Welcome to the last Arcturus gig. Ever." A few days later, the band officially announced that they had broken up. That sucked so much.
So finances permitting, I'm going to make a point of not missing gigs. Maybe I'll even meet some cool people with similar tastes ...