[Hessah]

But enhancing a no-stat weapon doesn't give you good return in in-game money when you're done with the weapon and try sell it... and that means you've used real life money but a not-so-good weapon...

Not saying your tip isn't good, it's a trade off between spending "less" RL money and in return earning less IG money... or spend more RL money at the beginning (by enhancing a great stat weapon to +9), sell it off later for a big price and buy your new gear with that money...