preparation for stormblood

[craized]

so ive been thinking lately, with stormblood on the horizon, is it worth taking the time now to start working on getting together things to help get things going when the expansion hits?

im talking primarily:

commercial manuals
and
collectables

manuals give 300k bonus exp per manual while gathering
and collectables give straight up exp varying depending on which you hand in.

ive done a bit of maths and I worked out that the difference between exp required to get from 1-50 and from 50-60 is roughly 2.8 x as much exp required. with 1-50 requiring 7,734,000 exp and 50-60 requiring and extra 21,736,800 exp

what's the likelihood that the difference between 50-60 and 60-70 will be the same?
meaning to get from 60-70 we'll need somewhere in the region of another 61 million exp.

my main worry is: are SE liable to nerf manuals and collectables to control the speed of levelling in the initial days of the expansion? did they do anything similar with the release of HW?

and is it worth farming these items or is it likely to be time wasted?