Actually, it isn't. Now that the swords are 1500 nstars it costs 450k to get them from the netherstar shop. I sold a melon sword in the last week for 390k. Then bought one later for 375k. His price is actually quite good.
With the melon sword i could farm the money I need to buy it. Actually I have 190k. I read that you don't accept payments but i need the sword and i can't afford it right now so I'll try to convince you: 160k in front, + 40k daily during 6 days (240k in 6 days). 400k total. I own my private pumpkin farm, is 50x50x17 (bigger than a 200x200) and how it is private when I finish farming the last floor the first is already fully growth, and I can easily turn it in a melon farm, in only 1-2 hours I can make the 40k of 1 day if I had the melon sword. Please think on it, thanks