MathJax, 160\$,円\$129\$,円\$455 / 256 ≈ 625\$,円\$506

A good old thousand-laughs-style code

\$\def\a{~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~}\def\b{\a\a\a\a\a\a\a\a\a\a}\def\c{\b\b\b\b\b\b\b\b\b\b}\def\d{\c\c\c\c\c\c\c\c\c\c}\d\d\d\d\d\d\d\d\$

yields quite an amount of <mtext>&amp;#xA0;</mtext>, <span class="mtext" id="MathJax-Span-403774" style="font-family: MathJax_Main;">&nbsp;</span> and <mtext>&nbsp;</mtext>.

MathJax, 529\$,円\$252\$,円\$640_ish / 256 ≈ 2\$,円\$067\$,円\$393

A good old thousand-laughs-style code

$$\def\a{🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣}\def\b{\a\a\a\a\a\a\a\a\a\a\a\a\a}\def\c{\b\b\b\b\b\b\b\b\b\b\b}\def\d{\c\c\c\c\c\c\c\c}\d\d\d\d\d\d\d\d$$

multiplies the gross inefficiency of representing exotic characters in MathJax by a considerable factor.

The StackExchange MathJax configuration limitation of 10\$,円\$000 macro expansions is being honored, while the limitations of the client’s browser, which are highly likely to cause problems expanding the macros, are not. (My browser is uncooperative as well, so the figure is an estimate.)