I used to struggle a bit with that. My first full time job was at a startup making puzzle/logic games and I was hoping that at one point everybody is going to play them and I'll be able to say "yeah, I worked on that". Needless to say it wasn't that successful at all, but I learned not to care that much. Money's in my bank account, food is on the table, everything's fine.

On the flip side, software not being material is also a plus - you make it once and distribute it an infinite number of times.