SKCNMs can be won easily in sparks gear by 1-3 people in normal. If it's really *that hard*, there's also Easy and Very Easy.
As for High Tier Battlefields, again, Very Easy and Easy exist. Spend 10 merit points and everyone gets 1 chapter, plus additional from the loot pool. These are easily doable in sparks gear, probably with less than 6 people (I know many battlefields on E or VE have been soloed). Heck, even normal should be doable in sparks gear, it just depends on the battlefield. Spend 80 merits (at worst) and you've got a 119 item; and learning the battlefields means eventually you can probably do it on Normal. Either way, if you're trying to obtain 119 gear with weak gear, it's obviously going to be difficult; there's a progression path you should follow (why not do skirmish? you're going to want that gear anyways).
If sparks are obtained so easily, then raising the cap would only make REM pages trivial to obtain. People should have a motivating factor to go out and try these battlefields, and currently, AF/Relic armors are a great way to do that.
As for skillup pages, you can skill up faster spending the time *skilling up* instead of spending your time farming sparks to buy skill up pages to skill up. You'll also get sparks, depending on your method, supplementing your skill gain rate. Wait, there's that word again...
