Yeah, basically all my headphones that I use now are modded in some way because I find a lot of fun in that. I even took apart my Stax SR-007 within the first couple of days to mod it. There’s a lot of merit to modding to your own preferences since not everything has to be technically amazing. I doubt people are looking to hear if a saxophone player is wearing corduroy or hear the sneeze in the twelfth row nearly as much as they just want to chill or jam out.
I have a $30 pair of Yamaha YH3’s (vintage orthos) that I’ve modded quite a bit and now I’m at the point where my friends and I preferred them to the much more expensive Sine in a lot of ways. Vintage orthos (so much info here) are an easy way for people to dip their toes into modding and learning what damping affects what for really cheap.