That's what I meant, Immy - I was (badly) trying to point out that calorie intake differs for everyone trying to put weight on, as does the kind of food they need to be eating - so specific advice meant for one person might not be any good for everyone else.
For example I've had a lot of success with eating large amounts of red meat (mmm... Steak!), but this would be no use at all to a vegetarian or with a cholesterol issue.
Numbers are pesky things, 1700 calories, 2000 calories, 2250, 2500 - it's all going to be relative depending on what kind of calories they are, height, weight, build and as you say activity levels, though in us bendybods those can be a bit screwy too, I know I burn off ludicrous amounts of energy doing very, very little!