Degrading other tax pros because of their fee structures doesn't happen here thankfully. Occasionally someone will mention a fee and others will encourage them to up it because no matter where they live, they are giving their talent and work away. $75 for a 1040 with SCHs A and B--no way!
Of course those who live in expensive areas have to charge more because their rent, property and state taxes, utilities, personnel, etc. cost way more. What matters is what's left over for you. Someone who charges $750 for a return may end up with $400, the same as someone who lives in a less costly area but charges $500 for the same return. I wonder if HRB fees vary from place to place. Anyone know?
Specialized knowledge warrants premium prices above and beyond the expected hourly rate. Many preparers do not do estates, trusts, partnerships, corps, returns with foreign income, etc. Those who do should feel no guilt charging for the effort and expense they put into acquiring those skills. Some preparers have developed niches in cryptocurrency. I bet they charge a lot--and they should.
Increase your fees at least enough to cover your increased expenses. Bear in mind that office supplies have gone way up and postage keeps increasing. Hopefully there will be enough to cover some pro bono work for clients who truly need but truly can't afford you.