For me, I have 4 other people under my roof and between work and home I have very little personal time to do my memory work. I'm one of those people who can't remember anything unless I at least mumble what I want to remember. That leaves me with 2 places I can do my work, at the lodge or shooting down the highway at 70 mph. Ask anyone who has done a few 200+ mile rides, you can get a lot of thinking done. As far as the rest of the biker culture goes, I really can't tell you the whys, either your a biker or your not.
If so very much time is taken up in your life simply by motorcycles, maybe you need to decide whether it's more important to be "a biker" or put in the effort for the "memory work". My Obligation in no way instructed me that Freemasonry was to bend itself around my hobbies and avocations. I don't demand Masons recognize some kind of appendant body for masonic fencers, brewers, or any of my other interests.
But who's to say there aren't good Masons-to-be out there but they haven't seen a venue comfortable to them to approach us for membership.
And who's to say that this is the real reason for membership problems? The perception of the Masonic membership issue is badly distorted away from reality. We look at the raw numbers and boohoo about loss of the Golden Days of the 1950s. So, gimmicks are tried, recasting and dressing up Freemasonry in "modern" or "more open" costumes. They won't work.
First, the actual peak of membership in the USA, adjusting for population changes, was 1927. That's right, 1927! Put that in your pipe and smoke it. When adjusting for total population size, we were already in decline, but two elements masked it.
1: Total increasing population gave a larger overall pool.
2: WWII created a gigantic cohort of men already well-conditioned to seek out fraternal organizations. Once that cohort of men had reached a certain age, they were no longer interested, and the original trend reasserted itself.
"Relevance" and fashionable appearance have nothing to do with Masonic membership. Something else is going on, and it's been going on for a very long time.