I find this discussion boils down to this; if a suit is not an everyday necessity, and your suiting is not part of the success equation, a decent suit for $500 is the way to go.
The only people who should be trying to decide between an MTM and bespoke suit are what is, in reality, a select few for whom an expensive wardrobe is a prerequisite, or, at the very least, a major part of their daily success with peers. It's ridiculous for someone to need an MTM suit for occasional wear.
I'm not throwing shade here, but the reality is that a decent suit should not be looked at as inferior to an MTM or above. There is just no justification for an even better suit if you are not one of the 5%. And if you are, the point is moot because you already have four of them.
Ordering on line should be for shave soap, not suits. They need to be fitted.
Following your logic most people would not need to purchase stainless steel razors, expensive (over $75) brushes, or high priced soaps.
In reality people should purchase the items they are comfortable with, whether it is shaving gear or suits.
There have been many useful links, and resources here for MTM suits.
Thanks to the members for posting them.