There are all sorts of organisations out there which will, for a fee, send your query to agents or editors, or your press release to newspapers, TV stations and the like. They usually do what they promise, and e-mail your information out to all the names on their mailing lists—and those lists can be vast, with tens of thousands of names on them. But what is the usual outcome of such a scattergun approach?
Well, first, you pay for their services. Then they send out your information (and if they've written your press release or query letter for you, they'll have charged you extra for this and will probably have written a formulaic, template-based piece which will have a very limited effect); and then—nothing.
You're unlikely to see good results, or to even make back the money that you paid them. Because the queries that they send out on your behalf will be generic, one-size-fits-all; they're not going to be personalised, addressed to individual people, or even targeted to appropriate agents or editors who represent your genre; and the press releases will go out to all their media contacts regardless of whether you're promoting a book about train-spotting in 1920s Sweden or a contemporary romance novel with an S&M twist.
Let me remind you: each time you send anything out, you have to target the right people. If you had a problem with your phone bill, you wouldn't just write to every person in every phone company you could find, would you? Regardless of what country you, or they, are in? No. You'd write to the customer services department of your phone provider, and tell them exactly what the problem is. It's the same with queries, submissions, media packs, press releases, and review copies. You must send them to the right people, otherwise the whole exercise is a pointless waste of everyone's time and money.