There’s two arguments to be made here:
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EQ does not “completely change” your headphone. It’s not the same as having a separate pair. If you sometimes want to hear your music in multiple different ways you need to own multiple headphones.
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While the first statement is true there is a moment when if you have too many pairs of headphones you can’t realistically use them all and some of them end up collecting dust and being useless.
How many headphones is too many headphones? Well that depends on the individual maybe. I personally can’t really use more than 3 pairs regularly.
Polite question 2 - why do you use the cheap IEMs for gaming and not the expensive ones?