Tespia Bugs and glitches!

Not yet, anyways. I mean depending on how long we're waiting for the NX Shields, if we even get them, you'll have plenty of time to make a good deal of 120-130 swords in hope for one of them to be 3line at least.

If you're going to use NX Shields then, sure, go that way. There's no reason not to do so.
Go with a Von Leon Sabre, scroll it 10 times, and voila: 180 W.Atk.

Thing is, I'm at the point where I'm rather sick of paying for NX as it is, and I don't spend that much on this game.
I mean, I'm gonna assume the protect scrolls will be at least 4k NX.

Best case scenario - All scrolls pass, meaning you only need 10 NX Shields.
10 scrolls x 4k NX = 40k NX = $40 = 800m mesos (1:20)

Worst case scenario (if the law of averages plays God) - Every fifth scroll passes, meaning you need 50 NX shields
50 scrolls x 4k NX = 200k NX = $200 = 4bil mesos

That's assuming they're that cheap (which, if they work in such a way, they won't be).
Also keep in mind that the "worst case scenario" is not actually the worst case.
Getting the weapon won't be the issue at all; scrolling it will be.
This game is not nearly interesting enough for me to ever be tempted to spend that much on it.

each 20% scroll is 20 coins, each coin is 500 maple leaves, going by averages, 1 out of 5 scrolls will pass, and your weapon has 9~10 slots total, so it's 5*500*20 equals 50 k leaves per slot, 450~500k leaves for 9~10 slots every maple weapon is 1, 3, or 5 coins depending of their level (35, 45?, and 64) so there.

Gotcha. I had no idea what the 'conversion rate' was.