It usually depends on the situation, on whether or not I'll pick up an NPC's coin drop. Most times it's really just a space issue, and I won't bother picking up coins if I know by the time I am done there I wouldn't even have 1k. If the NPC drops a decent amount of coins, like Fire Giants or Dusties, then I'll usually grab them when I see them. That's another situation where I always pick up coins, whether they are a large amount or not. If I am at an NPC that has alchable drops, and already have coins on me, or will at one point from alching whatever random object they drop, then I will always pick the coins up. Since I am already using an inventory slot, I may as well get as much cash as possible, no? Sometimes I'll leave coins on the ground for other people to pick up though, not because I'm lazy, but because I know some people need them more than I do. I call it my "subtle charity." For example, if I'm killing Guards in Falador for the occassional clue scroll in boredom, I will leave their coin drops on the ground. I know I'd have room for them, and that banks are nearby, but there are people that always come by and pick up the drops left on the ground, usually lower levels, that need them more than me. So, like I said, it totally depends on the situation. Most times I do pick up that random amount of change though, even if it doesn't seem to make any sort of impact on my bank. I do the same with runes I see lying around as well.