Dude, think about it. The guy lived in a orphanage in his past life. How is he going to become too flashy all of sudden? It has to have progression of character. I sign at the patreon of the author and there i read until chapter 63. It becomes evident that the MC is learning how to expend his money.

There is some grammatical mistakes but nothing that it is too evident and annoys the reader. I like it how the author seems to be improving his style as the chapters go on. If you stop at the beginning because it has some mistakes or author inexperience, you gonna regret because the novel becomes great after the chapter 20.