It's been my experience that potential clients are more concerned with price than your reputation, portfolio, education, certifications etc...
As I've said before I'm no longer try to be the design police. Less headaches and better money. Besides, I've gotten quite used to eating three times a day and having a warm place to sleep.
I think you've brought up a good point, but I don't think all customers are built the same and I'm convinced that the egomaniacs out there, who ram their ideas through on us, ignore our input, can be "spotted the minute they walk through our door" etc.. are just as obvious to other well meaning customers seeking our guidance, expertise and experience.
Its like the boorish, chronic complainers and whiners who flood sites like Yelp, TripAdvisor, etc. with their petty and extensive complaints about EVERYTHING. Most reasonable people take their "opinions" with a grain of salt and consider the source.
I worry far more about my reputation of being a service oriented, well rounded signmaker OPEN to working with all potential clients, than as a snobby, arrogant, standoffish, know it all who turns down anyone not bringing me spoon fed jobs that I fully approve of in advance. I've had some initially tough nut clients over the years that once I earned their trust, became both intensely loyal, but also very pro-active and vocal referral machines for me. If you read anything written by very successful people about how they achieved what they did, it is always about building trust and relationships with clients. You never know when that diamond in the rough client will develop into a career long advocate for your skills.
I also like the three meals a day and a warm bed deal.
I only design, so maybe my take on this is different but...
Most clients going into a sign shop are usually looking for price.
Most clients going to a design firm/ad agency/environmental graphic design firm are looking at your work.
Does your website or storefront cater to quality graphic design? or a sign shop that happens to design?
Does it scream replicator and cheap logo design?
I don't see having an opposite opinion to my clients as being snobby, arrogant, standoffish, know it all...
sometimes, on occasion, jobs must be turned down on principle... on occasion, a man (and kids) has to eat
but then there is college, a new car/truck once in a while, maybe buy a house, oh! insurance, retirement maybe
even a vacation once in a while, hobbies, tools, taxes, new computers and software upgrades... can't be done
with cheapie chump clients who have no taste (unless I had a spouse that worked and had insurance - which I don't)
I need clients willing to pay for my services as I would pay for theirs. I think I'm a decent designer, but in reality,
i'm looking for exceptional clients. Clients who are OPEN to new ideas and accept that equal exchange of ideas
is probably going to have exceptional results. Like I said, I will fire a client, and I will work with bad ones...
that way I can learn the art of compromise and maybe win over the occasional client with bad taste... or learn
that the client was right all along, and make adjustments in my thinking.
When presented with a client with bad ideas... that is usually well after a contract is signed. I have to
compromise or return some of the deposit. If the clients ideas are opposite of the design brief, they pay more.
If the ideas a really bad... well, how can I design a bad logo/layout/sign... I mean I have the capacity to
design bad, but in reality, it's really hard for me to do that. The opposite can not be said of sign shops with little
design skill. I've seen hundreds of sign shop websites, many of them I shake my head at wondering how they
think it's presentable work... naturally they are going to attract that kind of client. I think it's good to make
an honest assessment of your website, storefront, marketing materials and presentation... or continue to
wallow in lackluster clients.
Not many small sign shop websites impress me, but I find these sites effective at communicating good design/fabrication...
http://www.sideshowsignco.com
http://www.artsigns.com <---- not a pretty site, but nice work
http://diazsignart.com
http://starrstudios.net