I'd need a few more specifics to say (especially around your industry, whether or not you're already established, etc.), but-
It usually comes down to reputation and relationships. I'm assuming that this is some sort of service business (consulting or information management? I'm not sure what else would have 'research' as the only barrier to entry.)

The key is to not make your product a commodity. Differentiate it. Make sure you're providing a quality product, and that your clients/customers are receiving value for their cost. If it's worth it to them, they'll come back.
Make sure you focus on their experience, make it a good one, and don't give them a reason to look at your competitors.