Hypothetical Question about a company from the DND list. Are they dodgy?

Okay, so I didn't read the rules properly before posting before. But now my question and any answers have been removed.

But it is annoying that I can't read any of the responses.

So here is a question about a hypothetical company that may or may not exist.

I had success on a £25 pound order for three dissertation titles which impressed me with the level of detail and information I got for the £25. They have a UK postcode and proper contact details plus registration and VAT numbers. Is this enough to prove that they are a legitimate company and I will get value for money as I am considering spending a lot more in the near future?

If this post still goes against terms and conditions I am sorry, please delete it and I won't ever come on this site again. I'm not sure I can even be bothered with all this drama anyway. It does seem strange however that a legit company wouldn't want my custom, because in not being able to get any responses it makes me even more unlikely to spend a lot of money on them. The fact that they don't want to be talked about makes them more dodgy in my eyes, not less. A legit company would welcome people talking about them in a positive manner.