It's a control thing.
PCs can say, "I'd like to find a Staff of Power!", but they can't say, "wouldn't it be great if this thing I found were a Staff of Power?" ... because then you're edging into the territory of, "wouldn't it be great if this were a waterfall rather than a 300 foot high ant hill?" ... and, goddamn it, I prepped a goddamn session based on a goddamn 300 foot high ant hill, and you will LIKE it.
Shrug... I see the two as one in the same really. I agree calling out a retcon is not my favored way to go, except in rare cases.
Such as: We staretd 4e playing in KoTS, but then got the books a bit later. Some players wanted new characters now that we had the whole shebang, but I also wanted KoTS to be the start of the campaign. We retconned some things to make life easier.
usually I will do an invisible retcon. You want a staff of power... having a staff of power is reasonable in this campaign? I might just make that thing you found a staff of power afteral... You just never knew. Kind of like the One Ring thing.
You're smart, so I know you meant "effects the campaign" in the literate yet non-obvious sense.
Please make me believe.
Thanks, -- N
Maybe I'm not as smart as you think... Because I'm not sure I understand what you mean?
I'm saying that the act of putting something into play doesn't always = monty haul just by virtue of being powerull or expensive.
In my opinion at least, it's only monty haul if I put that item into the game, and then make no attempt to account for it in the future.
Example?
Your group of 1st level characters fighting a bunch of kobolds stumbles upon a dragon. You befriend the dragon, and continue in future adventures to face challanges set up for a group of your level without a dragon.-Monty Haul
Your group of 1st level characters fighting a bunch of kobolds stumbles upon a dragon. You befriend the dragon. Future adventures, however, consist of chalanges that account for 1st level characters with a dragon.- Not Monty Haul.
Also in 4e at least, you can really modify the dragon so it fits your campaign. Lower the level of whatever it is to equal one that fits your campaign.