I rarely attended lectures or seminars mainly because I don't learn well at all from having someone talk at me for an hour. Seminars yeah probably should've gone but again, I don't really gain much from talking things through with other people. I learn best by studying from a textbook by myself in all honesty, and the fees you pay are ultimately so that you gain a degree. For me, the money was still worth it to get my degree, and I still got my 2.1 by ignoring lectures etc and just getting on with the work in my own time, in the way I learn best.
Also, all the information from lectures is on the powerpoint slides that are put on Blackboard. So rather than go in for a 9am double lecture, too tired to focus and probably giving up on making notes halfway through, I preferred to read through them when I wanted to and do the studying when I wanted to. Unis don't like it if you don't go in, they threatened to kick me out a couple of times but ultimately if you're getting good grades they can't really argue. I would imagine it's if your grades come back badly that it becomes a problem, for me this didn't happen so managed to get away with it.