??? Where Does "High End" Start ???

Take solace in the fact that it’s a totally subjective determination so if you think it is then it is and vice versa. 

Of course, then there is always what the other guy listening thinks but who cares about what other people think?   Trust your ears, right?

It's simple.

If a system costs less than $35,607 it is lo-fi.

If a system costs more than $35,607 it is hi-fi.

If a system costs exactly $35,607 (including tax) it is mid-fi.

If you look at the top most expensive systems on here or other "extreme" audiophile hang-outs (god help you if it’s WBF), you’ll quickly find that even $5K per component is considered very cheap. 

"Performance" is a different matter and a whole ’nother can of worms. But I’d say that "normal high end" these days - loosely defined as some unquantifiable aggregate of: performance, build quality, aesthetic, esoteric factor, desirability, price, and brand cache - is going to start at ~25K per component and 50K for speakers. That’s not even "ultra" high-end, not even close. It gets more expensive each year; kind of nuts at this point. Definitely not sustainable.

Maybe rephrase the question 

What is the cost of admission to officially join the elite high end audio club? 
 

Some even accept riffraff like me so don’t give up hope!

Putting a dollar value on it is not an objective measure. Listen to many systems at all price points, develop your listening and evaluation skills. Hearing systems that appeal to you, try to replicate that at home, once you've reached your goal you're on the mountain top.