This subject is something I've given a lot of thought to recently as I'm in the same boat. There is no defining answer no matter how much I've analysed it. Well maybe there is one...rather two...ageing and the transport to and from games.
When I was younger I wouldn't miss a game and I would do anything to get there. Roughing it was part of the fun and this was in the era we weren't very good to say the least. It didn't seem to matter. I remember home games at Maine Road and even as a kid I could go to a night game and get home to Wythenshawe by 10pm. This was because games kicked off at 7:30pm and finished at 9:10pm. The half time was only 10 minutes then and very little extra time was added on. It was no hassle, queuing or nothing. I ran from the ground to Princess road depot, jumped on my bus ( Open doors then) and it soon left. Once it arrived it was a two minute walk to my house. The buses ran all over Manchester. There was no need to change trams or buses you could get on one straight home. Simple and easy.
Getting older the buzz of going to a live game just isn't the same, not for me anyway, I know for others it still is. The cold, rain, crap transport, late kick off times are all a factor. For late kick offs and night games the buses are one an hour and getting home often the last one I can't make meaning it's a long walk home or the extra cost of a taxi. With most of our games live on TV now it is tempting to put my ticket on the exchange and watch it in comfort at home. I will admit after a great win I do regret not going. The Liverpool game reminded me of how great being at the game can be, but that was a 12:30 kick off, ideal for me, although probably awful if you have to travel from further afield.
This isn't a moan just trying to explain and understand why my attitude to attending games has changed.