That's the issue I had, when I did manage to get to the local comic shop it had been so long I had at least 3-4 issues out for the six in a normal arc. So I'd let them pile up till I had a full arc and then read them, trades just became an easier way to read and store them.
The only single issues I sued to buy were ones where I thought the title needed support, but now I can do that digitally.