Maybe the bulk of their business is done locally, they have a loyal customer base and they think there's nothing wrong with their current operating model. Why change what isn't broken?
Or they are just busy and see it as something that is too much trouble and won't add value. If they aren't people who use the internet a lot themselves, they may struggle to see how a good online presence will help them.
But this ignores how quickly customer expectations are changing. Younger generations expect to be able to access information quickly online, and get answers to their questions when they want them.
They don't want to have to wait to phone at a time that suits.
If you expect them to hang on until 9am Monday to get in touch, they'll find someone else online in the meantime.
Businesses that stand out online will quickly corner the market and have a huge advantage over the competition.
People now put more store than ever in the experiences of others and the online world is a big conduit of that.
Your reputation can be made - and broken - very quickly with a couple of social media reviews.
People will seek recommendations from friends and family online in the same way they might have previously perused the Yellow Pages.
This means a well-managed social media presence can do wonders for your business - but being slack can cost you.
On the most simple level, a website gives would-be customers your contact details in the palm of their hands, when they do a web search for your products via their smartphones.
Getting online doesn't need to be expensive or difficult.
Get some advice on how to set up a good, useful website, a social media presence and perhaps an email newsletter to keep in touch with your regulars.
This is something that you cannot afford to be left behind on.