Strange argument that doesn’t really hold water.
You wouldn’t need to spend a billion pounds to sell out any game. Some clubs already have full houses for games. Some for the majority of their matches.
The game is, if we are being honest, small time but with potential for uplift. Making profits whilst not realising full potential isn’t a great place to be for a professional sports club providing any losses are sustainable - see above paragraph.
If you want all clubs to be profitable what would you cut? Players wages? Support staff? Academies? Scholarships? Ground capacities?
Increased marketing by most, if not all, clubs would be great for the game and I include your own loss making club in that.