The best accelerators do an amazing job of this. The best accelerators get you in front of dozens, even hundreds, of investors. The best accelerators know how to package up a product (start-ups) very well.
Anything else, anyone offering to sell you services for introductions — don’t do it. Not because it’s not worth it. In theory, it would be. But because for most VCs and angels, it’s such a negative signal that it is counterproductive.