Its one thing if someone keeps a chumra and it doesnt really affect anyone else. However in the Gebrochts case since the market for Passover food is small and short (People dont even want passover food after pesach even at a discount) so companies are forced to make only non-gebroachs items and make every else pay.
While the market for non-gebroachs may only be 20-30% of the passover food market, the market is so small its not really worth ignoring it.
I am forced to pay extra for this chumra no matter what I think of it. You cannot really avoid keeping this chumra even if you choose not too