I'm going to swim against the tide on this one
Never been a fan of freebie website builders or ones that offer templates and you limited ability to change or customise. CMS platforms like wordpress, joomla etc are great and allow you to build superb sites, but unless you download someone else's theme, and are happy making all the changes yourself, setting up SEO plugins, tuning etc etc, you will end up needing a web designer.
Most people these days will say a website is critical for business. But is it?
“I am reluctant to pay for a professional fancy pantsy site as frankly I don't need one, I have got this far without a site at all”
Looking at your own feedback, why squander precious time, resources and budget on a shiny website if your current marketing methods are generating business. A website needs to be managed and updated, it's needs to be found. Shiny websites with no visitors are as useful as chocolate teapots.
Facebook seems to be a good vehicle for you (business buzz word alert ) so why not capitalise on it. You have some ideas marketing wise to play on images with a typo, no reason why these couldn't be embedded into other articles or other networking sites, linking back to your facebook page.
You've also got good reviews on there, and your FB page shows up as number 2 if I google "pay for precision" as well as your Google panel on the right hand side. Add some reviews to your Google page, capitalise on your FB page. Google sometimes shows review stars for FB pages now as well.
Other than vanity, what extra will a website bring?
If you were looking to optimise for a specific keywords with an SEO strategy etc, then a web site would be essential, as would a budget. But I think you would be more effective adopting your current community/social marketing style IMHO.