You actually make a good point in general.
When purchasing anything from a website, you should always look at their means of contact.
If they are too shy to state either an address or at the very least a telephone number, then you have to seriously ask yourself how hard they will be to contact if the situation arises that you need to for whatever reason.
Don't be fooled by great pre-sales email communication, you need to judge them by their after sales communication, and if they are only giving you an email for contact, then there is usually a pretty good reason!