JMS Big Bang Tespia Open For All (?)

I have played gMS since January 2007 so I would say I have quite a bit of experiance.

You can't sell stuff like stews effectively, without having store (atleast at the less populated worlds). You also need pet with item pouch if you don't want to spend ages looting those etcs. Biggest problem however is that even 100million is barely worth anything nowadays. NX funded user can get that profit with few gachapon tickets at Mushroom Shrine.
Also, this is only one event. There's not many events that can get you significant profit.

I do not fully agree. Events are the big money making factor in GMS. There were two events that could net you upwards in the billions. Last year's witch belt event could net you a ton if you farmed those. Sure, you needed some nx to karma them, but it gives you more back in the longrun. Now, for those who did not want to spend ANY nx, there was an easy way. Farm 50% 2-handed wepon att scrolls and become rich instantly. If you did not farm 50%s that was your own fault. It was the single most easiest way to make money in GMS. Sure, events are tedious, but you have to take advantage and farm on most of them in order to make any good money. You get better rewards if you put forth more effort and are patient. Now, not every event will be that amazing, but most events still allow for a decent amount to be made if you farm something. Also, if you need a store permit, go do some nx surveys. It's pretty easy to get at least 1800 nx from those.