I'd imagine with Web design, those people might just be getting a quote to compare to others?
Can I ask if you're sure it isn't that?
You can normally tell when someone's a genuine customer with a genuine project. They'll tell you about it, and have a real passion for what they are doing, and often will have a good idea what they need from you. Typically they'll mention one or two key works in your portfolio they've seen that made them feel you were worth approaching.
But from time to time you get people who are just looking to get something for nothing. Normally something about an enquiry that tells you the project isn't likely to go anywhere, normally lack of information, or a 'copy/paste' feel to the email. This tells me they are just looking for the lowest cost for the work, and if a client is sourcing a designer/developer based solely on cost, they're probably not the sort of person I'd have a good working relationship with.
Obviously I would treat each potential client the same, but I normally know when I'm replying to enquiries which ones are likely to get a response, and which I'll never hear from again.
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