I did it in 2019 at the first US Open ran by Matchroom. It was amazing! I drew Albin Ouschan in the first round. I actually had a decent chance to win the first game. I did win my first and only game after Albin won the first 6.
The whole production was fantastic and it was a small step in building my game to play under the pressure of lots of spectators against such a punishing opponent.
I probably won't do it again unless it is alternate break since I would at least like an opportunity at the table in half the racks. The upper level pros are just too consistent with getting the 1 in the side and then immediately controlling the table from there.
I won two racks against my next opponent who was a lowly 775 fargo

So my US Open only cost me about $800 / game won! But at my age (57) the experiences are more important than the money.